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Volume 1, Issue 2

Damned if You Do and Damned if You Don’t

The Problem of God-talk in Biology Textbooks

Stephen Dilley and Nicholas Tafacory
DOI: 10.33014/issn.2640-5652.1.2.dilley.1

Abstract

We argue that a number of biology (and evolution) text-
books face a crippling dilemma. On the one hand, signifi-
cant difficulties arise if textbooks include theological claims
in their case for evolution. (Such claims include, for exam-
ple, God would never design a suboptimal panda’s thumb,
but an imperfect structure is just what we’d expect on nat-
ural selection.) On the other hand, significant difficulties
arise if textbooks exclude theological claims in their case for
evolution. So, whether textbooks include or exclude theo-
logical claims, they face debilitating problems. We attempt
to establish this thesis by examining 32 biology (and evolu-
tion) textbooks, including the Big 12—that is, the top four
in each of the key undergraduate categories (biology majors,
non-majors, and evolution courses). In Section 2 of our ar-
ticle, we analyze three specific types of theology these texts
use to justify evolutionary theory. We argue that all face
significant objections. In Section 3, we step back from con-
crete cases and, instead, explore broader problems created
by having theology in general in biology textbooks. We
argue that the presence of theology—of whatever kind—
comes at a significant cost, one that some textbook authors
are likely unwilling to pay. In Section 4, we consider the
alternative: Why not simply get rid of theology? Why not
just ignore it? In reply, we marshal a range of arguments
why avoiding God-talk raises troubles of its own. Finally,
in Section 5, we bring together the collective arguments in
Sections 2–4 to argue that biology textbooks face an in-
tractable dilemma. We underscore this difficulty by exam-
ining a common approach that some textbooks use to solve
this predicament. We argue that this approach turns out
to be incoherent and self-serving. The poor performance of
textbooks on this point highlights just how deep the diffi-
culty is. In the end, the overall dilemma remains: God-talk
or no God-talk?

1 Introduction

In his groundbreaking work, The Structure of Scientific
Revolutions, Thomas Kuhn argued that textbooks play a
crucial role in educating both scientists and non-scientists
about science. “[B]oth the layman’s and the practitioner’s
knowledge of science is based on textbooks and a few other
types of literature derived from them,” he wrote.1 On
Kuhn’s view, textbooks play a regulative role: they show
citizens and scientists the contours of the field, including
the puzzles that remain to be solved, what counts as an
acceptable solution, proper procedures for arriving at these
solutions, and the like. As Kuhn memorably puts it, text-
books are “pedagogic vehicles for the perpetuation of nor-
mal science.”2 That is, they give readers the correct vo-
cabulary, values, standards, and so on—all the goods of the
regnant paradigm. Textbooks even show readers how to
think about the history of science, its cumulative progress
to the present day, and its (glowing) prospects for tomor-
row. In brief, textbooks are a window to the past, a guide to
the future, and a defining ideal of the present. On Kuhn’s
view, they show us what science is.

It comes as something of a surprise, then, that quite a few
biology textbooks articulate a paradigm that is beset by a
theological muddle. The muddle itself centers on the pres-
ence (and absence) of theological claims in arguments for
evolutionary theory. It turns out that difficulties arise ei-
ther when God-talk is included or when it is excluded.

In this article, we defend three primary claims. First, we
argue that the presence of theology in biology textbooks
is problematic. Second, on the other side of the coin, we
contend that the absence of theology in biology textbooks
is likewise problematic. These two points lead directly to
our third main claim: textbooks are thus left in a crippling
dilemma—they are damned if they include theology and
damned if they don’t.

1Thomas Kuhn, The Structure of Scientific Revolutions, third edi-
tion (Chicago: University of Chicago Press, 1996 [1962]), 137.

2Kuhn, Structure, 137.



38 Damned if You Do and Damned if You Don’t

1.1 Textbooks

Our analysis focused on the following texts:

• Audesirk, Teresa, Gerald Audesirk, and Bruce E. By-
ers. Biology: Life on Earth, with Physiology. 11th ed.
Boston: Pearson, 2017.

• Barton, Nicholas H., Derek E.G. Briggs, Jonathan A.
Eisen, David B. Goldstein, and Nipam H. Patel. Evo-
lution. 1st ed. Cold Spring Harbor, NY: Cold Spring
Harbor Laboratory Press, 2007.

• Belk, Colleen and Virginia Borden Maier. Biology:
Science for Life. 5th ed. Boston: Pearson, 2016.

• Bergstrom, Carl T., and Lee Alan Dugatkin. Evolu-
tion. 2nd ed. New York: W.W. Norton, 2016.

• Brooker, Robert J., Eric Widmaier, Linda Graham,
and Peter Stiling. Biology. 3rd ed. New York, NY:
McGraw-Hill, 2014.

• Freeman, Scott, Kim Quillin, Lisabeth Allison, Michael
Black, Greg Podgorski, Emily Taylor, and Jeff
Carmichael. Biological Science. 6th ed. Boston: Pear-
son, 2017.

• Futuyma, Douglas J. and Mark Kirkpatrick. Evolu-
tion. 4th ed. Oxford, UK: Oxford University Press,
2017.

• Gunstream, Stanley E. Explorations in Basic Biology.
12th ed. San Francisco: Benjamin Cummings, 2012.

• Hall, Brian Keith and Benedikt Hallgrimsson. Strick-
berger’s Evolution. 5th ed. Sudbury, MA: Jones and
Bartlett Learning, 2014.

• Herron, Jon C. and Scott Freeman. Evolutionary Anal-
ysis. 5th ed. San Francisco, CA: Benjamin Cummings,
2014.

• Hillis, David M., David Sadava, Richard W. Hill, and
Mary V. Price. Principles of Life. 2nd ed. Sunderland,
MA: Sinauer Associates, 2014.

• Hoefnagels, Marielle. Biology: Concepts and Investiga-
tions. 4th ed. New York, NY: McGraw-Hill Education,
2018.

• Krogh, David. Biology: A Guide to the Natural World.
5th ed. Boston: Pearson, 2014.

• Mader, Sylvia S. Biology. 10th ed. New York:
McGraw-Hill Higher Education, 2010.

• Mader, Sylvia S. and Michael Windelspecht. Essentials
of Biology. 4th ed. New York: McGraw-Hill Educa-
tion, 2014.

• Mason, Kenneth A., George Johnson, Jonathan Losos,
and Susan Singer. Understanding Biology. 1st ed. New
York, NY: McGraw-Hill, 2015.

• Miller, Kenneth R. and Joseph S. Levine. Miller &
Levine Biology. Boston: Pearson, 2010.

• Morris, James et al. Biology: How Life Works. 3rd ed.
New York: W.H. Freeman and Company, 2019.

• Phelan, Jay. What Is Life?: A Guide to Biology. 4th
ed. New York: W.H. Freeman and Company, 2018.

• Raven, Peter H., Kenneth A. Mason, Jonathan B.
Losos, Susan R. Singer, and George B. Johnson. Bi-
ology. 10th ed. Dubuque, IA: McGraw-Hill, 2014.

• Ridley, Mark. Evolution. 3rd ed. Malden, MA: Black-
well, 2011.

• Russell, Peter J., Paul E. Hertz, and Beverly McMil-
lan. Biology: The Dynamic Science. 3rd ed. Pacific
Grove, CA: Brooks Cole, 2013.

• Sadava, David, David M. Hillis, H. Craig Heller, and
Sally D. Hacker. Life: The Science of Biology. 11th
ed. Sunderland, MA: Sinauer Associates, Inc. 2017.

• Simon, Eric J. Biology: The Core. 2nd ed. Boston:
Pearson, 2017.

• Simon, Eric J., Jean L. Dickey, and Jane B. Reece.
Campbell Essential Biology. 7th ed. New York: Pear-
son, 2019.

• Singh-Cundy, Anu, Michael L. Cain, Jennie Dusheck,
and Richard Symanski. Discover Biology. 5th ed. New
York: W.W. Norton & Company, 2012.

• Shuster, Michèle, Janet Vigna, Matthew Tontonoz,
and Gunjan Sinha. Biology for a Changing World,
with Physiology. 2nd ed. New York: W.H. Freeman
and Company, 2014.

• Solomon, Eldra Pearl, Charles Martin, Diana W. Mar-
tin, and Linda R. Berg. Biology. 11th ed. Australia:
Cengage Learning, 2018.

• Stearns, Stephen C. and Rolf F. Hoekstra, Evolution:
An Introduction. 2nd ed. Oxford, UK: Oxford Univer-
sity Press, 2005.

• Taylor, Martha R., Eric J. Simon, Jean L. Dickey,
Kelly Hogan, and Jane B. Reece. Campbell Biology:
Concepts and Connections. 9th ed. New York: Pear-
son, 2018.



Volume 1, Issue 2

1. INTRODUCTION 39

• Urry, Lisa A., Michael L. Cain, Peter V. Minorsky,
Steven A. Wasserman, and Jane B. Reece. Campbell
Biology. 11th ed. New York: Pearson, 2017.

• Zimmer, Carl, and Douglas John Emlen. Evolution:
Making Sense of Life. 2nd ed. New York: W.H. Free-
man and Company, 2016.

While our analysis examined a variety of chapters in each
textbook, we paid particular attention to two types of chap-
ters (or sections). The first of these areas sought to ar-
ticulate the historical context surrounding the advent of
Darwin’s theory. Notably, authors invariably attempted to
show the plausibility of Darwin’s theory relative to other
theories (or claims) available at the time. Thus, these back-
ground sections function as part of textbooks’ overall jus-
tification of evolutionary theory as the correct account of
biological unity and diversity. Second, in a similar vein, we
analyzed sections that directly presented the evidence and
arguments for (contemporary) evolutionary theory. Often
these areas were simply labeled “The Evidence for Evolu-
tion.” In sum, instead of looking at one-off remarks here
and there in a text, we especially focused on areas in which
authors explicitly offered historical or contemporary ma-
terial that they regard as firmly establishing evolutionary
theory. It is in these areas that we often found theology-
laden arguments and justifications.3

A critic might immediately demur, however. He might ar-
gue that the presence of theology is not really problematic.
After all, any God-talk in biology textbooks is just win-
dow dressing. Claims about ‘what a Creator would do’ are
only an historical element in the story of the rise of evolu-
tion; theological claims are not part of evolution’s epistemic
justification—the real reasons why evolution is worthy of
acceptance. That is, one might think that textbook au-
thors use God-talk only for rhetorical effect, while the ‘real’
evidence for evolution lies elsewhere. On this view, ‘real’ ev-
idence has to do with natural laws, entities, and processes,
including natural selection, random mutation, homological
similarities, and the like. Creationism only enters the pic-
ture as a type of (historical) object lesson; it’s nothing more
than an erstwhile and ersatz view that has been overcome
by evolutionary theory and its explanatory success.

By way of reply: there is a great deal to say on this score.
In a sense, our article as a whole functions as a response to
this objection. But for now, we offer a distinction that at
least makes an initial step toward our broader case: there

3In addition, we are cognizant of the difference between expla-
nations or illustrations of evolutionary theory, on the one hand, as
distinct from epistemic justifications or arguments for that theory on
the other. Our focus is on instances of theology in the latter rather
than the former.

is a difference between the evidence for evolution per se
versus the evidence for evolution as presented in textbooks.
Our goal is to examine textbooks as they portray the case
for evolutionary theory. Our task is not to analyze the
case for evolution as it appears in some other medium or
in an idealized form. Rather, we focus on what textbooks
actually say. Whatever else might be the case, a reader
can hardly be faulted for thinking that what appears in
“the evidence for evolution” chapter (or section) is precisely
what textbooks present as the evidence for evolution. So
even if, in some proper sense, God-talk is irrelevant to the
justification of evolution per se, this fact is beside the point.
What matters for present purposes is the textbooks as they
stand.

1.2 Methodology

Before turning to the argument itself, however, a brief word
about our methodology may be helpful. In particular, how
did we decide which texts to include on our list? Our pri-
mary interest is in undergraduate biological education in
the United States. In this domain, there are three main
categories: textbooks for biology majors, non-majors, and
evolution courses, respectively. We intentionally included
the top four textbooks in each of these categories in 2017-
2018.4 Thus, we directly examined the Big 12. Any study
that purports to have robust conclusions must analyze the
leading textbooks; that is precisely what we have done.

Yet we did not simply limit our study to the top titles in
each category. In the interest of intellectual diversity, we
wanted to hear more than just the most visible voices. As
such, we looked at a range of books: some are recent, others
are over a decade old; some are for high school, but most are
for college; some are single author, others are multiple au-
thors; some are alive and well, others are now discontinued;
some are fairly basic, others much more advanced.5 And so

4While publishers tend to be cagey about releasing sales infor-
mation, NAVSTEM helpfully tracks enrollment figures each year in
biology courses (and their associated textbook selections) in over 350
colleges and universities across the United States. Arguably, their
data are the best available. See their market briefs for “Biology-
Majors,” “Biology for Non-Majors,” and “Evolution,” respectively
(www.navstem.com). According to their research, the top four titles
in 2017-2018 in biology courses for majors are Urry et al., Campbell
Biology; Freeman et al., Biological Science; Morris, How Life Works;
and Sadava et al., Life, respectively. The top four titles in biology
courses for non-biology majors are Taylor et al., Campbell Biology:
Concepts and Connections; Simon et al., Campbell Essential Biol-
ogy; Phelan, What Is Life? ; and Shuster, Biology for a Changing
World, respectively. The top four titles in evolution courses are Her-
ron and Freeman, Evolutionary Analysis; Zimmer and Emlen, Evolu-
tion; Bergstrom and Dugatkin, Evolution; Futuyma and Kirkpatrick,
Evolution, respectively.

5We did not exclude any book after consideration except for two



40 Damned if You Do and Damned if You Don’t

on. Readers familiar with the broad landscape of biology
textbooks will recognize that our list nicely represents the
field.6

1.3 Other Preliminaries

A few other matters will clarify the terminology and scope
of our study. First, we realize that a given textbook does
not always say precisely what the author (or authors) be-
lieve. To some extent, textbooks represent combined efforts
and compromises between authors, reviewers, the publisher,
school boards, and so on. Accordingly, when we use phrases
like “textbook authors say” or “textbook authors believe,”
we have in mind either the text itself or the relevant com-
munity behind it.

Second, by “evolutionary theory,” “Darwinian evolution,” or
just plain “evolution,” we mean the standard account found
in biology textbooks, typically a contemporary version of
Darwin’s theory (i.e. an updated version of the Modern
Synthesis).

Third, by “theology,” we mean propositions about any su-
pernatural deity. These propositions need not be system-
atic, justified, or connected with any particular tradition.
They need not approach the rigor or precision typical of
professional theologians. Instead, by “theology,” we simply
have in mind propositions, of whatever sort, about any su-
pernatural god. For stylistic variety, we will sometimes use
the term “religious claims” (or something similar) instead
of the term “theological claims.”

Fourth, it must be said that our argument does not imply
that there is something wrong with evolutionary theory it-
self or with the comprehensive justification for it. Simply
because we contend that textbooks are caught in a debil-
itating dilemma does not imply that evolution cannot be
defended elsewhere with greater vigor and precision. Our
concern is not with the theory itself nor its general ground-
ing, but only with textbook accounts.

Finally, in what follows, by “the presence of theology” or
“the absence of theology,” we actually have in mind the pres-
ence (or absence) of (i) theological propositions (ii) as part
of the evidence for evolution—as part of a given argument
or justification for evolutionary theory—in (iii) sections of
biology textbooks that self-consciously provide grounds for
the truth of evolution. But rather than spell out these three

instances in which the books in question essentially mirrored the line
of thought already found in other books we were considering.

6According to NAVSTEM, even if we consider only the Big 12 text-
books, these alone comprise 64.7% of student enrollments in biology
major, non-major, and evolution undergraduate courses in 2017-18.

features every time, for brevity and stylistic reasons, we will
abbreviate by using phrases like “the presence of theology”
or “the absence of theology,” or even shorter phrases like
“include theology” or “exclude theology,” and so on. The
context should make matters clear in each case.

1.4 Overall Structure and Thesis of the
Article

Having covered preliminaries, we now turn to a general map
of our article, including a guide to our key claims. Recall
that our overall contention is that biology textbooks face an
unhappy dilemma: problems arise if they include or exclude
theology.

We attempt to establish this claim in four parts. In Sec-
tion 2, we examine concrete examples of three different
types of theology used to justify evolutionary theory in
biology textbooks. We argue that all face significant dif-
ficulties. In Section 3, we step back from concrete cases
and, instead, explore broader problems created by having
theology in general in biology textbooks. We argue that
the presence of theology—of whatever kind—comes at a
significant cost, one that some textbook authors are likely
unwilling to pay.7

In Section 4, we consider the alternative: Why not simply
get rid of theology? Why not just ignore it? In reply, we
contend that attempts to avoid God-talk raise difficulties
of their own. For many textbooks, this option is equally
unattractive.

Finally, in Section 5, we bring together the collective argu-
ments in Sections 2–4 to argue that biology textbooks face
an intractable dilemma. Problems abound whether they
include or exclude theology. We underscore this difficulty
by examining a common approach that some biology text-
books use to try to solve this predicament. We argue that
their approach is incoherent and self-serving. The poor per-
formance of textbooks on this point shows just how deep
the difficulty is. In the end, the overall dilemma remains.

7As it happens, we are not in principle opposed to the presence
of God-talk in biology textbooks. We personally think that this ap-
proach has some merit. Some textbook authors may agree with us on
this score. But, as we will argue, others will find that this approach
is deeply unwelcome.



Volume 1, Issue 2

2. THE PROBLEMATIC PRESENCE OF THEOLOGY—CONCRETE EXAMPLES 41

2 The Problematic Presence of
Theology—Concrete Examples

In this section, we analyze three types of theology in biology
textbooks. We call them: straw god theology, presumptive
theology, and indeterminate theology.8 Each type functions
as a crucial element in various arguments that directly or
indirectly support evolutionary theory. Unfortunately, each
type also suffers serious difficulties. These difficulties un-
dermine the pro-evolution arguments that contain them.
More generally, the failure of these arguments nicely illus-
trates the broader problem of incorporating God-talk into
biology textbooks.

Two qualifications must be made at the outset. First, this
section of our article is not a comprehensive analysis of all
types (or instances) of theology that appear in the text-
books on our list. There is more God-talk afoot than we
highlight, both here and in other biological texts.9 Such
cases strengthen our argument, but are beyond the present
scope. Second, in this section, we argue that the strong ma-
jority of textbooks on our list include theology of one kind
or another. But beyond this particular segment, our overall
argument in this article focuses on the dilemma of includ-
ing or excluding God-talk, rather than on problems that
arise from the sheer amount of theology in biology text-
books. Thus, while Section 2 focuses on (many) instances
of theology, our broader argument emphasizes the deeper
predicament surrounding the general presence or absence of
theology. In this sense, our argument is qualitative rather
than quantitative.

8We borrow the term “straw god” theology from Jonathan Wells,
“Darwin’s Straw God Argument,” Journal of Interdisciplinary Stud-
ies 22 (2010): 67–88. However, our use of the term is not identical
to his. As far as we know, the terms “presumptive theology” and
“indeterminate theology” are unique to our discussion.

9The seminal work on the role of theology in the justification of
evolution is Paul Nelson, “The Role of Theology in Current Evolution-
ary Reasoning,” Biology and Philosophy 11 (1996): 493–517. See also
Gregory Radick, “Deviance, Darwinian-style,” Metascience 14 (2005):
453–57, esp. 455; Stephen Dilley, “Charles Darwin’s use of theology
in the Origin of Species,” British Journal for the History of Science,
vol. 45, no. 1 (2011): 29-58; Stephen Dilley, “Nothing in Biology
Makes Sense Except in Light of Theology?” Studies in History and
Philosophy of Biological and Biomedical Sciences 44 (2013): 774–
86; Abigail Lustig, “Natural Atheology,” Darwinian Heresies, ed. A.
Lustig et al. (Cambridge: Cambridge University Press, 2004), 69–83;
Casey Luskin, “Zeal for Darwin’s House Consumes Them,” Liberty
University Law Review, vol. 3, no. 2 (Spring 2009): 403-89; Casey
Luskin, “Darwin’s Poisoned Tree,” Trinity Law Review, vol. 21, no. 1
(Fall 2015): 130-233; Wells, “Darwin’s Straw God,” 67-88; Cornelius
Hunter, Science’s Blind Spot (Grand Rapids, MI: Brazos, 2007); Cor-
nelius Hunter, “Darwin’s Principle: The Use of Contrastive Reasoning
in the Confirmation of Evolution,” HOPOS 4 (Spring 2014): 106–49;
Cornelius Hunter, Darwin’s God (Grand Rapids, MI: Brazos, 2001);
Cornelius Hunter, “The Random Design Argument” Communications
of the Blythe Institute, vol. 1, issue 2: 23–36 [this issue].

2.1 Straw God Theology

The first type of theology we label “straw god theology” be-
cause it mischaracterizes certain rivals to evolution, making
them easier to knock down. More specifically, this mis-
characterization is typically part of a line of reasoning that
indirectly supports evolutionary theory by attacking op-
ponents such as special creation or young-Earth creation-
ism. Eighty-four percent of the textbooks on our list deploy
straw god theology.10

The Classical Scene

While our primary interest is the contemporary scene, we
begin by briefly noting two broad caricatures of nineteenth-
century special creation. First, a number of textbooks we
studied characterize special creation as holding a young-
Earth view.11 Some of these texts seem to have taken
Bishop Ussher as the authoritative voice on the matter,
while others do not mention him by name but nonetheless
nod in the same direction. The authors of Biological Sci-
ence write, for example:

When Darwin published his theory in 1859 in a
book called On the Origin of Species by Means
of Natural Selection, it unleashed a firestorm of
protest throughout Europe. At that time, the
leading explanation for the diversity of organisms
was an idea called special creation. Special cre-
ation held that: (1) All species are independent,
in the sense of being unrelated to each other; (2)
life on Earth is young—perhaps just 6000 years
old; and (3) species are immutable, or incapable
of change. These beliefs were explained by the
instantaneous and independent creation of living
organisms by a supernatural being.12

In fact, the discussion of a young Earth as a central matter
of dispute between creationism and Darwinian evolution did

10See Figure 1 for a full list.
11While some textbooks explicitly claim that special creation in-

cluded a young-Earth view, others imply a close connection to one
degree or another, often by characterizing young-Earth creationism
as Darwin’s primary rival. For example, Hoefnagels, Biology: Con-
cepts and Investigations, p. 238; Urry et al., Campbell Biology, p.
467-68; Mader, Biology, p. 266; Raven et al., Biology, p. 11; Belk and
Maier, Biology, p. 207; Miller and Levine, Miller & Levine Biology, p.
450, 453-54; Phelan, What Is Life?, p. 300-304, 336-37; Herron and
Freeman, Evolutionary Analysis, p. 38, 62, 66; Freeman et al., Bio-
logical Science, p. 435, 438; Mader and Windelspecht, Essentials of
Biology, p. 238; Zimmer and Emlen, Evolution, p. 29-34, 52; Simon
et al., Campbell Essential Biology, p. 247; Taylor et al., Campbell
Biology: Concepts and Connections, p. 260-61.

12Freeman et al., Biological Science, p. 435.



42 Damned if You Do and Damned if You Don’t

not occur until the twentieth century. Early critical reviews
of the Origin of Species by an array of prominent thinkers
simply ignored this topic.13 Moreover, the most prominent
‘creationist’ work of the time, William Paley’s Natural The-
ology, did not advocate a young Earth view.14 Instead, the
most notable “age of the Earth” attack was from William
Thompson (later, Lord Kelvin) who contended that the
Earth was between 20 and 400 million years old, with the
most probable time landing at 98 million.15

Second, some textbooks erroneously state (or imply) that a
literal reading of Genesis was basically the only one avail-
able for Christian creationists in the centuries (or years)
leading up to the Origin of Species.16 Consider, for exam-
ple, Douglas Futuyma’s well-known textbook, Evolution.
In the opening pages, the text juxtaposes Darwinian evo-
lution with pre-Darwinian views of flora and fauna. Ac-
cording to Futuyma, these early views included Plato and
Aristotle’s idea that “species have fixed properties.”17 After
this Greek notion came Christian ideas: “Later, Christians
interpreted the biblical account of Genesis literally and con-
cluded that each species had been created individually by
God in the same form it has today. (This belief is known as
‘special creation.’)”18 In the rest of the narrative, Futuyma
gives no hint that other views were available to Christian
thinkers. Similarly, in a passage that provides the histor-
ical backdrop to the rise of evolutionary theory, the au-
thors of Discover Biology assert: “The literal interpretation
of scripture, especially the book of Genesis, shaped Judeo-
Christian views about the origins of life, and these were em-
bellished by a succession of biblical scholars. James Ussher,
a seventeenth-century archbishop of Armagh in Northern
Ireland, claimed to know the exact date that all life was
created: October 23, 4004 BC.”19 In the rest of the pas-

13See the fine collection in David L. Hull, Darwin and His Critics
(Chicago: University of Chicago Press, 1973).

14William Paley, Natural Theology, twelfth edition (London: J.
Faulder, 1809); Adam Shapiro, “William Paley’s Lost ‘Intelligent De-
sign,” ’ History and Philosophy of the Life Sciences, vol. 31, no. 1
(2009): 55-77; Adam Shapiro, “Darwin’s Foil: The Evolving Uses
of William Paley’s Natural Theology 1802-2005,” Studies in History
and Philosophy of Biological and Biomedical Sciences, vol. 45 (2014):
114-23.

15William Thomson (Lord Kelvin), “Of Geological Dynamics,” Pop-
ular Lectures and Addresses, vol. 2 (1869): 73-131. Thomson was
supported by Fleming Jenkin, one of the critics most worrisome to
Darwin. Fleming Jenkin, “The Origin of Species,” [1867] in Darwin
and His Critics, 303-44.

16For example, Singh-Cundy et al., Discover Biology, p. 386-87;
Belk and Maier, Biology, p. 207; Bergstrom and Dugatkin, Evolution,
p. 33; Simon, Biology, p. 152; Simon et al., Campbell Essential
Biology, p. 244-48, esp. 245, 247; Taylor et al., Campbell Biology:
Concepts and Connections, p. 260-61, esp. 260.

17Futuyma and Kirkpatrick, Evolution, p. 9.
18Futuyma and Kirkpatrick, Evolution, p. 9.
19Singh-Cundy et al., Discover Biology, p. 386. As a minor detail,

this quote slightly mischaracterizes Ussher’s view. Ussher held that
God began creating the heavens and the earth on the “evening pre-

sage, the authors are silent about other Christian views on
the matter, which suggests to readers that a “literal inter-
pretation of scripture, especially the book of Genesis” was
the only option available prior to and during Darwin’s era.

Of course, untold numbers of Christians (and special cre-
ationists) did interpret Genesis in this manner in the cen-
turies (or years) prior to the Origin. And it is true, as some
textbooks observe, that developments in geology during the
early-to-mid nineteenth century did cause many Christian
thinkers to give up literalist claims about Genesis, includ-
ing a so-called universal flood.20 However, our concern is
that Futuyma and other like-minded authors do not give
any indication that, by Darwin’s day, non-literal interpre-
tations of Genesis were well known in Christian (and cre-
ationist) circles and, more directly, a literal interpretation
of Genesis was not a crucial issue among most scientists
who were Christians. In his seminal study, Charles Dar-
win and the Problem of Creation, historian Neal Gillespie
observed that during the evolution controversy, the dispute
about the presence of biblicist thinking in science “was not
whether literalism in biblical interpretation should survive,
nor was it whether science contradicted the Bible.... The
point of conflict, rather, was the intellectual autonomy of
science.”21 It is unsurprising, then, that an array of elite
Christian men of science of that era accepted views of cre-
ation that did not require a literal interpretation of Gen-
esis.22 Moreover, as Rev. William Hayden estimated in
1851, even among the “Christian public,” fully half did not
believe that Genesis was to be taken literally.23 None of this
was without precedent, of course. The Christian tradition
includes a long history of non-literal interpretations, which
date back to the Church Fathers. In the fourth century, St.
Augustine, who ranks as one of the most influential theolo-
gians of all time, adopted a metaphorical view of “days” in
his commentary on Genesis.24 Other Church Fathers, like

ceding the 23rd day of October” in 4004 B.C.; biological life did not
appear until October 25. Contrary to Singh-Cundy et al., Ussher did
not claim that God created “all life” on “October 23.”

20The classic study is Charles Coulston Gillespie, Genesis and Ge-
ology (New York: Harper & Row, 1951).

21Neal Gillespie, Charles Darwin and the Problem of Creation
(Chicago: University of Chicago Press, 1979), 47.

22The ranks of Christian (or Christian-leaning) thinkers whose
views of creation did not require a literal interpretation of Genesis
included Georges Cuvier, William Paley, Adam Sedgwick, William
Hayden, John William Dawson, Arnold Guyot, Asa Gray, William
Whewell, John Herschel, James Dwight Dana, and others.

23William B. Hayden, Science and Revelation; or, The Bearing of
Modern Scientific Developments upon the Interpretation of the First
Eleven Chapters of Genesis (Boston: Otis Clapp, 1852), 77. Hayden
himself was disappointed that the number was not greater. See also
Ronald Numbers, “Creating Creationism: Meanings and Uses since
the Age of Agassiz,” Evangelicals and Science in Historical Perspec-
tive, eds. David Livingston et al. (Oxford, UK: Oxford University
Press, 2014), 236.

24One must be careful about the terms ‘literal’ and ‘metaphorical’



Volume 1, Issue 2

2. THE PROBLEMATIC PRESENCE OF THEOLOGY—CONCRETE EXAMPLES 43

Clement of Alexandria, Origen, and St. Cyprian, likewise
accepted figurative interpretations of Genesis.25 Contrary
to the claims of some textbooks, Christian creationists held
diverse approaches to Scripture.

Unfortunately, other mischaracterizations of special cre-
ation surfaced as well.26 Even so, our concern in pointing
out these errors is not to defend special creation. On the
contrary, we think the biological data run counter to this
view. Yet these mischaracterizations concern us. In each
case above, the caricature in question is part of a larger pas-
sage (or chapter) in which textbook authors seek to show
that special creation is empirically inferior to Darwin’s the-
ory. That is, these mischaracterizations play a key role in
indirect arguments for evolution. The problem, of course,
is that these arguments are rife with straw gods.

The Contemporary Scene

Unfortunately, we also found mischaracterizations of con-
temporary versions of creationism. These mischaracteriza-
tions are not simply innocuous misrepresentations. They
appear in sections of the text that are meant to provide
support for current evolutionary theory. For example, like
a number of textbooks, Mark Ridley’s Evolution miscon-
strues the locus of divine activity.27 Ridley juxtaposes evo-
lutionary explanations for adaptation with creationist ones:

Creationism, by contrast, has no explanation for
adaptation. When each species originated, it must
have already been equipped with adaptations for
life, because the theory holds that species are
fixed in form after their origin. An unabashedly

when used to delineate the exegetical methods of Church Fathers.
In The Literal Meaning of Genesis, Augustine purported to give the
proper meaning of the text rather than a metaphorical or so-called
literal one (in the modern sense). Using this approach, he concluded
that “day” in Genesis should not always be viewed as a 24-hour time
period. Augustine, On Genesis, trans. Edmund Hill (Hyde Park, NY:
New City Press, 2004).

25While the Church Fathers overwhelmingly thought the Earth was
young, nonetheless they were of different minds about the so-called
literal interpretation of Genesis. See Clement of Alexandria, Stro-
mata 6.16; Origen, Contra Celsum, Book 6.50, 60; St. Cyprian, Trea-
tise 11.11.

26For example, Russell et al., Biology, p. 440; Phelan, What Is
Life?, p. 300-304, 336-37; Krogh, Biology, 285; Freeman et al., Bio-
logical Science, fifth edition, Appendix A:24; Shuster et al., Biology
for a Changing World, p. 322-24.

27We found that very few textbooks recognize that modern cre-
ationism (and intelligent design) hold that God (or a designer) is not
limited to creating only at the taxonomic level of species (or lower).
Better texts include, for example, Futuyma and Kirkpatrick, Evolu-
tion, which sometimes avoid this error (p. 578) and sometimes does
not (p. 44). And, despite some inaccuracies, Ridley, Evolution, in-
cludes helpful nuances, esp. p. 43-70. See also the discussion below.

religious version of creationism would attribute
the adaptiveness of living things to the genius of
God.28

In this passage, Ridley implies that, according to creation-
ism, God created at the level of “species” (ostensibly equip-
ping each species with necessary adaptations for their re-
spective environments). In fact, for quite some time, many
creationists, including even young-Earth creationists, have
explicitly rejected the claim that God created exclusively
at the species taxonomic level. In 1947, young-Earth cre-
ationist Frank Lewis Marsh noted, “On every occasion cre-
ationists will continue to make the matter very clear that
the modern ‘species’ is not usually the same sort of group
of organisms as is the Genesis kind.”29 In The Genesis
Flood, the 1961 seminal text of modern creationism, John
Whitcomb and Henry Morris claimed that God created
“kinds,” which they regard as a taxonomic level distinct
from “species.”30 And in the present-day, Andrew Snelling’s
two volume work, Earth’s Catastrophic Past, which is per-
haps the most sustained defense of young-Earth creationism
available, holds that Genesis kinds “may be identical with
the genus or even the family.”31 Moreover, Michael Behe,
the most prominent scientist in the intelligent design move-
ment in the past two decades, argues that unaided natural
processes can account for some biological phenomena at the
level of species and genera. In these cases, it is unnecessary
to posit an intelligent cause.32

The cases mentioned above are hardly unusual. As his-
torian Ronald Numbers observes in his analysis of cre-
ationism and speciation, “By the 1970s, most of the lead-
ing special creationists had long since abandoned belief in
the fixity of species and had embraced extensive—and ex-
tremely rapid—organic evolution within the originally cre-

28Ridley, Evolution, p. 67, see also p. 263-64. N.B. Ridley uses the
term “adaptiveness” rather than “adaptedness.”

29Frank Lewis Marsh, Evolution, Creation, and Science, second edi-
tion (Washington, D.C.: Review and Herald Publishing Association,
1947), 199; see also 197-98. More than a decade earlier Byron Nel-
son made a similar point. Byron C. Nelson, “After Its Kind”: The
First and Last Word on Evolution, fourth edition (Minneapolis, MN:
Augsburg Publishing House, 1931), 18-25.

30John C. Whitcomb and Henry M. Morris, The Genesis Flood
(Phillipsburg, NJ: P & R Publishing, 1961), 66-69, especially 69.

31Andrew A. Snelling, Earth’s Catastrophic Past, 2 vols. (Dallas,
TX: Institute for Creation Research, 2010), vol. 1: 215. John Morris,
son of creationist icon Henry Morris, and president emeritus of the
Institute for Creation Research, regards Snelling’s 1500-page work as
the sequel to The Genesis Flood. See Morris, “Foreword,” Earth’s
Catastrophic Past, vol. 1, ix-xi.

32Michael J. Behe, Darwin Devolves (New York: HarperOne, 2019),
esp. 141-70. While intelligent design theory itself does not identify
the ‘designer’ as ‘God’ per se, biology textbooks generally hold that
the theory (tacitly) posits a supernatural designer. Accordingly, in an
effort to take these texts on their own terms, we will treat ID as a
theology-laden theory.



44 Damned if You Do and Damned if You Don’t

ated ‘kinds’ mentioned in the first chapter of Genesis.”33 He
further points out: “Despite the popular image of creation-
ists being wedded to the fixity of species, no one argued
for more rapid speciation by means of natural selection . . .
[than] the creationists.”34 Whatever else may be the case,
modern creationism (and intelligent design) do not restrict
the creator’s activity exclusively to the species-level.

A second and related concern now surfaces. In presenting
the case for evolutionary theory, a number of texts seem
to assume that arguments which favor evolution over nine-
teenth century special creation, as they construe it, likewise
favor evolution over contemporary creationism or intelligent
design.35 But arguments that address a past foe are not al-
ways relevant to a present adversary. To be sure, some of
the classic arguments obviously apply to the present con-
text. For example, empirical data about the ancient age
of Earth are highly relevant to assessing the plausibility of
current versions of young-Earth creationism.36 Nonethe-
less, many textbooks do not make clear how other argu-
ments for the superiority of evolution over special creation
also demonstrate evolution’s superiority over key contem-
porary rivals, notably old-Earth creationism and intelligent
design. Textbooks need not nuance every jot and tittle of
creationism, of course. Yet all too often, textbook authors
seem to assume that if creationists of yesteryear believed
such-and-such, then creationists of today must as well. Yet
in his preeminent study of creationism, Ronald Numbers
observes that, even among relatively informed individuals,
a “common assumption seems to be that one creationist is
pretty much like another.” But, as he says bluntly, “nothing
could be further from the truth.”37

Stepping back, we have noted several instances of “straw
god” theology in biology textbooks. This theology mis-
characterizes rivals to evolution, such as special creation
or young-Earth creationism, making them easier to knock
down. Moreover, this mischaracterization is typically part
of a line of reasoning that directly or indirectly supports
evolutionary theory. Caricatured God-talk thus serves as

33Ronald Numbers, “Ironic Heresy: How Young-Earth Creationists
Came to Embrace Rapid Microevolution by Means of Natural Selec-
tion,” Darwinian Heresies, eds. Abigail Lustig et al. (Cambridge,
UK: Cambridge University Press), 84-100, see esp. 87.

34Numbers, “Ironic Heresy,” p. 100.
35Fortunately, a few textbooks are better on this score. They in-

clude, for example, Futuyma and Kirkpatrick, Evolution, 573-84, 600,
although see p. 44; Ridley, Evolution, p. 44, 67-69; Raven et al.,
Biology, p. 432-33. Curiously, the first edition of Zimmer and Emlen,
Evolution, is better on this score than the second edition (see p. 320
of the first edition).

36Further discussion about the “appearance of age” and “uniformi-
tarianism” are relevant, of course.

37Ronald L. Numbers, The Creationists: From Scientific Creation-
ism to Intelligent Design, expanded edition (Cambridge, MA: Harvard
University Press, 2006), 9.

part of the positive case for evolution.

2.2 Presumptive Theology

We now turn to a second type of theology, which we label
“presumptive theology.” This type includes highly confi-
dent statements about God’s nature or ways. We regard
these claims as “presumptive” not simply because of their
level of certitude but also because they are typically as-
serted without any justification whatsoever. Over 60% of
the textbooks we analyzed deployed this theology in some
of their positive arguments for evolutionary theory.38

Example 1

Several textbooks draw on presumptive theology as part of
their positive case for common ancestry. For example, one
textbook argues:

An engineer would never use the same underly-
ing structure to design a grasping tool, a digging
implement, a walking device, a propeller, and a
wing. Instead, the structural homology exists be-
cause mammals evolved from the lungfish-like an-
cestor that had the same general arrangement of
bones in its fins.39

A few observations are in order. First, consider how an
38Notably, the content and form of presumptive theology can vary

widely from case to case. Sometimes it is articulated in rhetorical
questions; other times it takes the form of tacit approval of Darwin’s
use of it in his own arguments for evolution; still other times, textbook
authors appeal to what is “reasonable,” and so forth. More generally,
presumptive theology typically involves one or more of the following:
(i) direct claims about God, a Creator, etc., (ii) claims about an en-
gineer, designer, etc. in contexts in which the most likely referent is a
divine engineer or designer, (iii) claims about what we would expect
given a (particular) creationist or ID view, or (iv) claims about what
we would expect had the phenomenon in question arose “from scratch”
(or some other phrase that, in context, has creational overtones). Ex-
amples can be found in Russell et al., Biology, p. 440, more elliptically
on p. 475; Simon, Biology, p. 161; Bergstrom and Dugatkin, Evo-
lution, p. 115; Herron and Freeman, Evolutionary Analysis, p. 56,
see also 98; Krogh, Biology, p. 293-95; Audesirk et al., Biology, p.
265-66, 270-71; Zimmer and Emlen, Evolution, p. 40; Mader and
Windelspecht, Essentials of Biology, p. 248, elliptically; Barton et
al., Evolution, p. 75, 81; Futuyma and Kirkpatrick, Evolution, p. 45:
“. . . many features that no intelligent engineer would be expected to
design”; Simon et al., Campbell Essential Biology, p. 250; Urry et
al., Campbell Biology, p. 477-78, elliptically, but see p. 467-68 for
context; Taylor et al., Campbell Biology: Concepts and Connections,
p. 264, elliptically; Mason et al., Understanding Biology, p. 9-11, esp.
11; Mader, Biology, p. 277, elliptically; Raven et al., Biology, p. 9,
432-33, elliptically. A full list can be found in Figure 1.

39Freeman et al., Biological Science, p. 442-43.



Volume 1, Issue 2

2. THE PROBLEMATIC PRESENCE OF THEOLOGY—CONCRETE EXAMPLES 45

“engineer” is described. Such an individual would “never”
use the same design plan as a basis for very different tools.
The assumption in play is:

Under no circumstances would an engineer ever
modify a single structure for an array of different
functions.

A second observation relevant to the passage is that its
broader context contends that homologous features count
as evidence for common ancestry over creationism. For ex-
ample, the opening paragraphs of the homology section,
which frame the entire passage, state that “advocates of
special creation. . . could not explain why striking similar-
ities existed among certain organisms” whereas “common
ancestry” can explain these similarities.40 Likewise, the fi-
nal paragraph of the section, which summarizes the overall
point, says in full, “The theory of evolution by natural se-
lection predicts that homologies will occur. If species were
created independently of one another, as special creation
claims, these types of similarities would not occur.”41 Ac-
cordingly, in this context, the claim about an “engineer”
refers to a supernatural Creator. As such, the argument
contains a theology-laden assumption:

If God designed different species with biological
structures analogous to a grasping tool, a digging
implement, a walking device, a propeller, and a
wing, respectively, then he would never use the
same underlying structure, modifying it specially
for the particular needs (and limbs) of each new
species.

A final observation, already implied, is that the passage
makes a comparative argument. The data of “structural
homology” are said to favor common ancestry over the di-
vine engineer hypothesis. Stated a bit more precisely, the
argument appears to be:

1. If evolutionary theory is true, then we would very much
expect to find some mammals with the “same gen-
eral arrangement of bones” in their appendages (due
to their descent from a “lungfish-like ancestor”).

2. If God engineered different species with biological
structures analogous to a grasping tool, a digging im-
plement, a walking device, a propeller, and a wing, re-
spectively, then he “would never use the same underly-
ing structure,” modifying it specially for the particular
needs (and limbs) of each new species.

40Freeman et al., Biological Science, p. 441.
41Freeman et al., Biological Science, p. 443.

3. As a matter of fact, we have discovered that some
mammals have the “same general arrangement of
bones” (or “underlying structure”) in their appendages.

4. If the evidence is very much expected on one hypothesis
but totally unexpected on another, then the evidence
strongly supports the former over the latter.

5. Thus, the fact that some mammals have the “same
general arrangement of bones” (or “underlying struc-
ture”) in their appendages strongly supports evolution-
ary theory over the divine engineer hypothesis.

Premise two is crucial. It makes a claim about what a divine
engineer would never do. Accordingly, the argument as a
whole includes a substantive theological assertion. We will
examine this assertion shortly. But first another example
may be helpful.

Example 2

Some textbooks use subtler language but nonetheless mar-
shal an argument with much the same level of confidence.
What is Life?, for example, states the following:

Among adult animals, several features of anatomy
reveal the ghost of evolution in action. Many
related organisms show similarities that can be
explained only through evolutionary relatedness.
The forelimbs of mammals such as bats, por-
poises, horses, and humans are used for a variety of
very different functions (FIGURE 10-39). If each
had been designed for the uses necessary to that
species—flying, swimming, running, grasping—we
would expect dramatically different designs. And
yet, all of these species possess the same bones—
modified extensively—revealing that they share a
common ancestor.42

This passage makes a claim about what a designer would
do: “If each [mammalian forelimb] had been designed specif-
ically for the uses necessary to that species. . . we would ex-
pect dramatically different designs.” On this view, a de-
signer would make “dramatically different designs” rather
than designs that are ‘somewhat different’ or even ‘notably
different.’ Given that the surrounding context of the pas-
sage clearly points to a divine designer,43 the argument
rests on the following assumption:

42Phelan, What Is Life?, p. 332-33. “FIGURE” refers to a drawing
in the original text.

43The text frames the rise and justification of Darwin’s theory in
contrast to key creationist claims, inter alia. See Phelan, What Is
Life?, p. 300-304, 336-37.



46 Damned if You Do and Damned if You Don’t

If God had designed each mammalian forelimb
specifically for the uses necessary to its particu-
lar species, then he would have made dramatically
different forelimb designs.

Notice that the author does not qualify this key assumption
about a divine designer. Apparently, readers are to believe
that, if God had directly designed each mammalian fore-
limb, He would always make dramatically different designs.
At first glance, the argument seems less stalwart than our
earlier example, yet closer inspection shows a familiar level
of theological certitude.

Observations and Evaluation

We turn now to macro-level analysis of these cases. Each
of the examples above functions as a crucial premise in a
positive argument for evolution. These arguments vary in
particulars but nonetheless follow a basic form:

1. If evolutionary theory is true, we would expect X.
2. If God directly designed each species (or limb, etc.),

then we would “never” expect X.
3. We have found X.
4. If the evidence is very much expected on one hypothesis

but highly unexpected on another, then the evidence
strongly supports the former over the latter.

5. Thus, X strongly supports evolutionary theory over the
hypothesis that God directly designed each species (or
limb, etc.).

Premise two is of keen interest. In the examples analyzed
above, premise two took various forms, depending on a
given textbook’s specific language. Yet the general idea
in both cases is that God would not do such-and-such—in
this case, the deity would not use a common template to
fashion new appendages for new species.

A few observations are in order. Although our observations
will focus on the two cases in question, these observations
apply to cases of presumptive theology in other textbooks
as well.44 First, in whatever form, premise two is crucial
for the argument. If it is removed, the argument is logically
invalid, and the conclusion no longer follows. For the pro-
evolution argument to be successful, premise two has to be
present and justified.

44As Figure 1 makes clear, 20 out of 32 textbooks contain presump-
tive theology.

Second, the argument is part of the positive case for evolu-
tionary theory. It is not simply a critique of contemporary
creationism (or intelligent design). Instead, as the conclu-
sion makes clear, the whole point of the argument is to show
that evolution better explains the empirical data.

Third, as far as we can tell, premise two is not entailed, or
made probable, by young-Earth creationism or intelligent
design, for example. In particular, nothing in these views
holds that God (or a designer) would never use a template
for multiple designs. In fact this very notion has been chal-
lenged by creationists as far back as the 1930s.45 Intel-
ligent design theorists have likewise openly disputed this
claim since the early years of the movement.46 The upshot
is that textbook authors have not accurately represented
contemporary creationist or intelligent design tenets and
shown that these tenets conflict with the empirical data.

Instead, textbook authors have brought their own claims
to the table, including their own partisan God-talk. They
presuppose that God would create brand new bone struc-
tures, never drawing on a common template. As philoso-
pher Paul Nelson observes in a similar context, their un-
derlying assumption is that “[i]f the creator is free to do as
he pleases, the appearance of [a] plan can become the ap-
pearance of limitation or constraint, suggesting an unimag-
inative or even slavish repetition of structures along some
predetermined pattern.”47 These textbook authors assume
that the “apparent uniformity of certain biological patterns
is inconsistent with the freedom of a creator to act as he
wishes.”48 On this view, the deity’s free will necessitates
originality. The Almighty loves novelty.

But textbook authors overwhelmingly fail to provide justi-
fication for their sectarian theology. They do not cite any
sources, whether secular or religious. Instead, their parti-
san claims function as brute assertions unaccompanied by
evidence, reason, or argument. Just where one would ex-

45Byron Nelson actually made this a pivotal element in his challenge
to evolutionary theory. See Nelson, “After Its Kind,” 37-51, 61-68.
In the 1940s, Frank Lewis Marsh raised the matter with Theodosius
Dobzhansky in The Dobzhansky-Marsh Correspondence, 1944-1945,
p. 42-43.

46Nelson, “The Role of Theology,” 493–517. Phillip E. Johnson,
Defeating Darwinism (Downers Grove, IL: InterVarsity Press, 1997),
62-64, 73-75, 80, 114. This point has been raised in more recent
publications as well: Jonathan Wells, Icons of Evolution (Washing-
ton, D.C.: Regnery Publishing, 2000), 67-70, 281. Paul Nelson and
Jonathan Wells, “Homology in Biology: Problem for Naturalistic Sci-
ence and Prospect for Intelligent Design,” Darwinism, Design, and
Public Education, John Angus Campbell and Stephen C. Meyer, eds.
(East Lansing, MI: Michigan State University Press, 2003), 303-22.
Winston Ewert, “The dependency graph of life,” BIO-Complexity, vol.
3 (2018): 1-27, doi:10.5048/BIO-C.2018.3.

47Nelson, “The Role of Theology,” p. 511, emphasis altered.
48Nelson, “The Role of Theology,” p. 511; cf. Lustig, “Natural

Atheology,” p. 75-76.



Volume 1, Issue 2

2. THE PROBLEMATIC PRESENCE OF THEOLOGY—CONCRETE EXAMPLES 47

pect textbooks to give good grounds—after all, arguments
for evolution are central to modern biology—these texts in-
stead offer precisely nothing.

Fourth, as far as we can tell, religious students in general are
not rationally obligated to accept the theology in question.
While we are surely not experts in world religions, these
partisan theological claims do not appear to be entailed, or
made probable, by any of the Abrahamic traditions. More-
over, they do not appear to be entailed, or made proba-
ble, by a number of other serious religious views, including
process theism, henotheism, polytheism, religious plural-
ism, Confucianism, religious Taoism, Theravada Buddhism,
Mahayana Buddhism, and Nirguna Brahman-oriented Hin-
duism. This is not to say that a reader who adheres to
one of these views cannot accept the theological claims in
question. Rather, it’s only to say that, as far as we can tell,
a given religious reader is entirely free to reject these text-
books’ partisan theological claims, all things being equal.49

Moreover, atheist or agnostic readers are not rationally ob-
ligated to accept the theology in question either. Of course,
a given atheist or agnostic reader could in principle accept
the counterfactual ‘were a god with certain properties to
exist, he would never use a common template.’ But the
fact that this assertion might fit within a given atheist’s or
agnostic’s worldview is beside the point. Instead, the cen-
tral matter is that, all things being equal, there is nothing
about the content or justification of atheism or agnosticism
per se that rationally mandates acceptance of this counter-
factual. As with religious readers, non-believers can regard
textbooks’ partisan theology as entirely optional. They can
take it or leave it.

*

Let us pause briefly to consider the ramifications of our
analysis. In each case above, presumptive theology was
brought to bear in an argument for evolution. While pre-
sumptive theology is not limited to any particular type of
argument for evolution, the two examples given are both
versions of the homology argument. This is no small mat-
ter. The homology argument is widely regarded as one of
the best arguments for evolutionary theory.

Of course, not all versions of the homology argument draw
upon God-talk. Nonetheless, some clearly do. Our concern

49If we consider a believer of a particular religious tradition qua be-
liever in that particular tradition, then, all things being equal, she is
epistemically justified in rejecting the presumptive theology in ques-
tion either because (i) her tradition does not conceive of divine action
in this manner or (ii) her tradition does not require its adherents to
accept the claim that, were a monotheistic God to exist, he would
“never” use a common design, or the like.

is with these versions, particularly those that depend upon
“presumptive” theology—strident assertions about the di-
vine unaccompanied by any justification. They highlight,
once again, problems that arise when God-talk is present
in biology textbooks.

2.3 Indeterminate Theology

Is there another way forward? One possibility is to opt
for statements that are more circumspect. “Indeterminate
theology,” as we call it, achieves this goal. This theology
claims that God can create in various ways without specify-
ing that he definitely would have created in a specific way.50
Twenty-five percent of the textbooks on our list contain in-
determinate theology.51 We analyze two examples below.

Example 1

In a section on the evidence for evolution, the authors of
Biology argue:

An excellent example of an imperfect design is
the eye of vertebrate animals, in which the pho-
toreceptors face backward toward the wall of the
eye. . . . As a result, the nerve fibers extend not
backward, toward the brain, but forward into the
eye chamber, where they slightly obstruct light.
Moreover, these fibers bundle together to form the
optic nerve, which exits through a hole at the back
of the eye, creating a blind spot.
By contrast, the eye of mollusks [sic]—such as
squid and octopuses—are more optimally de-

50For stylistic reasons, we sometimes employ the pronoun “he” when
referring to “God.” Of course, our argument does not hinge upon
thinking of God in masculine terms as opposed to feminine or neuter
terms.

51In total 8 textbooks include indeterminate theology, which typ-
ically involves one or more of the following: (i) direct claims about
God, a Creator, etc., (ii) claims about an engineer, designer, etc. in
contexts in which the most likely referent is a divine engineer or de-
signer, (iii) claims about what we might expect given a (particular)
creationist or ID view, or (iv) claims about what we might expect
had the phenomenon in question arose “from scratch” (or some other
phrase that, in context, has creational overtones). See Figure 1 for a
full list. Note that some texts are less clearly theological than oth-
ers: Mason et al., Understanding Biology, p. 442, for context see p.
9-11, 446-47, 451; Morris, How Life Works, 393; Sadava et al., Life,
p. 420, 443; Hillis et al., Principles of Life, p. 291; Krogh, Biology,
p. 8 uses indeterminate theology, or something like it, to argue that
certain appeals to an “intelligent designer” fall outside of science. In
addition, a few examples surfaced in earlier editions of the textbooks
on our list, notably, Audesirk et al., tenth edition, Biology, p. 273;
Futuyma, Evolution, third edition, p. 639: “. . . a thoughtful designer
could arrange.”



48 Damned if You Do and Damned if You Don’t

signed: The photoreceptors face forward, and the
nerve fibers exit at the back, neither obstructing
light nor creating a blind spot. . . .
Such examples illustrate that natural selection is
like a tinkerer, working with whatever material is
available to craft a workable solution, rather than
like an engineer, who can design and build the best
possible structure for a given task. Workable, but
imperfect, structures such as the vertebrate eye
are an expected outcome of evolution by natural
selection.52

A few observations are in order. First, the authors write
that an engineer “can” design and build the best possible
structure for a given task. Notice that the language of
“can” does not say that it is likely an engineer would do so.
Instead, this passage only comments on what an engineer
is capable of doing. An engineer is able to do X; he is free
to do X. This is a claim about possibility, not probability.

Second, the broader context clearly indicates that this pas-
sage is part of the authors’ justification for evolutionary the-
ory over and against creationism and intelligent design.53
As such, the authors’ claim about an engineer is meant to
apply to a divine Creator.54 So, given that the argument
quoted above focuses on the eye of vertebrate animals, a
key claim of this argument is:

God “can design and build the best possible” eye
for vertebrate animals.

Or, to put the matter in a conditional statement:
52Raven et al., Biology, p. 428-29.
53On the next page, the authors state: “It is difficult to understand

vestigial structures such as these as anything other than evolutionary
relicts, holdovers from the past” (Raven et al., Biology, p. 430). Two
pages later, they drive home their message: “inefficiencies of certain
designs, such as the vertebrate eye and the existence of vestigial struc-
tures, do not support the idea of an intelligent designer” (p. 432-433).
Clearly, the authors argue that the data of inefficient or imperfect
structures, like the vertebrate eye, count as evidence for evolution-
ary theory over intelligent design. Moreover, in the opening pages of
the textbook, the authors indicate that a perennial rival to evolution-
ary theory is creationism: “In Darwin’s time, most people believed
that the different kinds of organisms and their individual structures
resulted from direct actions of a Creator (many people still believe
this)” (p. 8). The next several pages reinforce the notion that cre-
ationism is a key opponent of evolution (p. 9-12).

54Presumably, their claim applies to non-divine higher intelligences
as well. In fact, their claim apparently applies to any intelligent being
who is capable of creating an eye and who knows the principles of
engineering (at least as the authors understand these principles). So,
while their claim about “an engineer” applies to more than just God,
it does not apply to less.

If God were to create the vertebrate eye, then he
“can design and build the best possible” eye for
vertebrate animals.

Or, equivalently:

If God were to create the vertebrate eye, then per-
haps he would “design and build the best possible”
eye for vertebrate animals.

The language of ‘perhaps’ captures the provisional nature of
the statement that God “can” do such-and-such as opposed
to the assertion that he would do such-and-such. God’s
actions are ‘indeterminate,’ as we say, given that the state-
ment (and argument) in question only asserts what God
is able to do rather than what he would definitely do or
probably do.

We will explore this claim, and the argument it serves, in
due course. But first we turn to another example.

Example 2

In a summary of “The Evidence for Evolution,” another
textbook gives empirical arguments that common ances-
try is superior to “the alternative hypothesis,” which holds
“that species have been individually created by a supernat-
ural being.”55 Among these arguments is the famed homol-
ogy argument, which, in this case, draws on indeterminate
theology from a different angle:

Similarity of structure despite differences in func-
tion follows from the hypothesis that the charac-
teristics of organisms have been modified from the
characteristics of their ancestors, but it is hard to
reconcile with the hypothesis of intelligent design.
Design does not require that the same bony ele-
ments form the frame of the hands of primates,
the digging forelimbs of moles, the wings of bats,
birds, and pterosaurs, and the flippers of whales
and penguins.56

In this passage, the authors give a clear argument that a
similar bone structure in various limbs counts as evidence
in favor of common ancestry over intelligent design. That
is, ‘similarity’ is a natural prediction of the common ances-
try hypothesis—it “follows from” descent with modification.

55Futuyma and Kirkpatrick, Evolution, p. 44.
56Futuyma and Kirkpatrick, Evolution, p. 44.



Volume 1, Issue 2

2. THE PROBLEMATIC PRESENCE OF THEOLOGY—CONCRETE EXAMPLES 49

By contrast, design “does not require” similar structural el-
ements.

Three elements are worthy of our attention. First, in a
recent article, Warren Allmon and Robert Ross regard this
argument as the “most compelling argument for interpreting
homologous similarities as evidence of evolution.”57 In our
view, Allmon and Ross’s conclusion is especially notable
because it arises from a thoughtful and fair-minded analysis
of various attempts to render the homology argument in its
strongest and most accessible form. If they are correct,
then any flaws in this version of the homology argument
are particularly significant.

Second, this homology argument hinges upon God-talk.
The reference to “intelligent design” in the main passage
above is, for the authors, an implied reference to a super-
natural hypothesis. In the opening paragraph of the pas-
sage, which frames how the homology argument is to be
understood, the authors compare common ancestry to “the
alternative hypothesis”—namely, that “species have been in-
dividually created by a supernatural being.”58 Elsewhere
in the text, intelligent design is likewise characterized as
creationism in “camouflage.”59 So, a creationist deity is in
the picture.

Third, the authors’ portrayal of this creationist hypothe-
sis is quite provocative. The authors do not say that, on
the God hypothesis, similarity is ‘unexpected’ or ‘improba-
ble’ or ‘surprising.’ Instead they claim that this hypothesis
“does not require” similarity. In other words, God does not
have to use a common design plan; he is capable of creat-
ing each species (and each concomitant limb) de novo, in
which the limbs of every species have a unique underlying
bone structure. That is, the Almighty can create different
structures each time. He is not required to reuse a similar
pattern. So the argument depends upon a crucial assump-
tion:

If God created each species individually, then he
was not required to use a common design pat-
tern from which to fashion the limbs of different
species.

This is another way of saying:

If God created each species individually, then he
57Warren D. Allmon and Robert M. Ross, “Evolutionary remnants

as widely accessible evidence for evolution,” Evo. Edu. Outreach,
vol. 11, no. 1 (2018), p. 9. See the discussion on p. 8 as well.
(doi.org/10.1186/s12052-017-0075-1.)

58Futuyma and Kirkpatrick, Evolution, p. 44.
59Futuyma and Kirkpatrick, Evolution, p. 578.

can create unique bone structures for limbs of dif-
ferent species.

Once again, we have the language of possibility. God is
not required to do such-and-such; he is free to do the op-
posite. As we have seen, this idea can be expressed in the
statement:

If God created each species individually, then per-
haps he would create unique bone structures for
limbs of different species.

This is indeterminate theology from another angle.

Observations and Evaluation

While each argument above has its particular focus, pro-
evolution arguments that draw on indeterminate theology
generally have the same basic structure:

1. If evolutionary theory is true, then X is highly expected
(or virtually inevitable).

2. If God directly created each species (or organ, etc.),
then perhaps he would create not-X.

3. X is true.
4. If X is highly expected (or virtually inevitable) on one

hypothesis, but not-X is possible on another hypothe-
sis, then X strongly supports the former over the latter.

5. Thus, X strongly supports evolutionary theory over the
hypothesis that God directly created each species (or
organ, etc.).

In our view, premise two makes a rather modest claim that
it is possible for God to create not-X. Both in general and
in biology textbooks, the term “God” typically refers to a
Being who is omnipotent. Even in cases in which texts men-
tion a generic “supernatural being,” rather than the God of
monotheism per se, it is generally understood that a deity
of this sort has the ability to do quite a lot. One of the
perks of divinity, we gather, is having a fair bit of power at
hand.

So, the claims that, for example, ‘God can design and build
the best possible eye for vertebrate animals’ or that ‘he can
create dissimilarity rather than similarity’ are trivialities.
They involve nothing contrary to God’s powerful nature
and they do not express or entail a logical contradiction.



50 Damned if You Do and Damned if You Don’t

These statements are true, but only in the most uninfor-
mative way, like saying that a normal human is capable of
blinking. Unremarkably, premise two passes muster.

At this point, however, a critic might worry that our assess-
ment has been unfair. He might say that our interpretation
of “can” is too literal. When textbook authors state that
God “can” do such-and-such, they really mean that God
“would” do such-and-such. In this sense, indeterminate the-
ology is actually just poorly articulated presumptive theol-
ogy.60

By way of reply: in our view, it is better to give textbook
authors the benefit of the doubt by taking seriously what
they actually say rather than to speculate about what they
allegedly intend to say. Competent users of the English
language know the difference between “can” and “would.”
They also know that the former does not imply the latter:
if a free agent has the ability to do X, it simply does not
follow that they will do X. (Most adults in the United States
have the ability to vote Libertarian in every election, for
example, yet that hardly means they will.) So, we plainly
disagree with the objection. But even if we are wrong—that
is, even if indeterminate theology collapses into presumptive
theology—then the only thing that follows is that there
are even more cases of presumptive theology than we had
previously counted. And these cases are plagued by all the
problems that accompany this type of theology. So, deep
difficulties remain. Thus, our broader argument about the
problematic presence of theology continues unabated.

In any case, for now let us suppose we are correct that
indeterminate theology is a genuine means by which some
textbook authors argue in favor of evolution. As noted, we
analyzed premise two of this type of argument above. It
passed inspection. Unfortunately, premise four does not.
Recall the premise:

If X is highly expected (or virtually inevitable) on
one hypothesis, but not-X is possible on another
hypothesis, then X strongly supports the former
over the latter.

To see why this premise is false, imagine that we have ev-
idence E and two hypotheses, H1 and H2, which are com-
peting accounts of E. Suppose further that H1 predicts E
to a very high degree, so much so that the denial of E is
unthinkable. Suppose also that H2 predicts E to a very
high degree as well, yet the denial of E is logically possible
given H2. If we discover E, this evidence barely favors H1

60Alternatively, a critic might say that authors don’t necessarily
have in mind what God “would” do, but perhaps only what he would
“probably” do. We address this idea in Section 3 below.

and H2, if at all. It’s virtually a dead heat. This means
that premise four is false. When applied to this scenario,
premise four mandates that E would “strongly support” H1
over H2. But E does no such thing. It favors H1 by just a
whisker. As a result, premise four is flawed. It articulates
(or entails) an epistemic principle that falls prey to a clear
counterexample.

A colorful example may help illustrate this point. Suppose
two scientists, Kopp and Schoss, each champion their own
new theory in physics, respectively. These theories are in
competition to explain a new datum. Kopp’s theory, let
us say, is deterministic. And, much to Kopp’s delight, it
predicts the datum to a very high degree. In fact, given
the deterministic nature of Kopp’s theory, as well as other
relevant factors, it is unthinkable that his theory would not
predict the datum. So, given Kopp’s theory, the datum has
a probability of 1, let us say. By contrast, Schoss’s theory
is indeterministic in a narrow sense; it allows the slimmest
possibility of indeterminate events in certain conditions on
the rarest of occasions. Schoss’s theory also happens to
predict the datum to a very high degree, in this case to
a probability of .99. So which theory does the datum fa-
vor? The answer is that it barely favors Kopp’s theory over
Schoss’s theory.61 The former predicts the datum with cer-
tainty; the latter almost to the same degree. Clearly, it
would be flatly wrong to conclude that the datum “strongly
supports” Kopp’s theory over Schoss’s theory. Instead, it’s
nearly a dead heat.62

The upshot is that premise four is false. And this is signifi-
cant because premise four, or something like it, is required
for the logical validity of the argument. If the premise
(or its near equivalent) were removed, then the conclusion
would no longer follow from the remaining premises. So,
removal of premise four destroys the argument. On the
other hand, keeping the premise saddles the argument with
a false claim. This renders the argument as a whole un-
sound. Thus, whether premise four is retained or jettisoned,
the argument has fallen short.63

Of course, it is possible to modify premise four in order
to make it passable. An improved version would have
to say something like: data strongly favor one hypothe-

61Likelihoods, or something like them, are in play here: empirical
data D favor competing hypothesis H1 over hypothesis H2 if and only
if Pr (D |H1) > Pr (D |H2).

62In fact, this example is overly sympathetic to premise four.
Schoss’s theory allows the physical possibility of the denial of the da-
tum, whereas premise four only allows the logical possibility of not-X.
Premise four has an even greater burden to bear.

63Of course, one can salvage premise four by getting rid of the
“strongly supports” language and, instead, opting for “barely sup-
ports.” However, doing so means that the biological data barely sup-
port evolution over creationism. But this runs emphatically contrary
to textbook presentations of “the evidence for evolution.”



Volume 1, Issue 2

3. THE PROBLEMATIC PRESENCE OF THEOLOGY—GENERAL CONCERNS 51

sis over another just in case the data are expected on one
but not the other. That is, the data formidably support
one over the other (only) if there is a clear contrast in
expectations between the two hypotheses. Unfortunately,
this is where indeterminate theology rears its head. Un-
der its mantle, premise two neither expects nor prohibits
the data. It merely states what God would perhaps do.
But without a clear expectation, textbooks cannot make
a contrastive claim that one hypothesis definitely expects
the data more than the other does. Thus, indeterminate
theology in premise two undercuts precisely the require-
ment needed for a persuasive version of premise four. If an
improved version of premise four is to succeed, textbooks
must compare clear expectations of each hypothesis. But if
they cannot form a clear expectation of the God hypothesis,
then they cannot compare it to the expectations of an evo-
lutionary hypothesis. As such, they cannot say that data
favor the expectations of the latter over the former. As a
result, they cannot claim that the evidence supports evolu-
tionary theory over the God hypothesis. The argument as
a whole fails, and indeterminate theology strikes the fatal
blow. Thus, even with a defensible version of premise four,
the argument remains unsalvageable.64

*

Let us pause for a moment to summarize our argument.
Recall that, in the previous section, we analyzed “presump-
tive theology.” This approach makes unsupported asser-
tions about what God would do or would not do—for ex-
ample, God would “never” use a common design plan for
different limbs in various species. Claims like this are bold,
especially when unaccompanied by any justification. The
natural corrective to this combination of high confidence
and low justification is a bit more circumspection about
God’s purported actions. A humbler approach is to note
that God “can” do such-and-such, rather than to assert that
he must do such-and-such. Yet, as we have seen, the lan-
guage of “can” has problems of its own.

In fact, difficulties plague both approaches. Presumptive
theology (coupled, as it is, with no justification) constrains
a divine being’s actions too severely and so devolves into
dogmatic certitude. By contrast, indeterminate theology

64For more on the testability of God hypotheses with respect to
evolutionary hypotheses, see Elliott Sober, Evidence and Evolution
(Cambridge, UK: Cambridge University Press, 2008), 109-88; Elliott
Sober, Did Darwin Write the Origin Backwards? (Amherst, NY:
Prometheus Books, 2011), 121-54. Replies to Sober include Daniel
Lim, “A Critique of Elliott Sober’s Goals and Abilities Objection to
the Design Argument” Science and Religion: Historical and Contem-
porary Perspectives conference, Lancaster University, July 2007; Dil-
ley, “How to Lose a Battleship,” 621-23. See also our discussion of the
contrastive nature of scientific testing in Section 4 below.

does not constrain God’s actions at all and so never rises
above triviality. Troubles abound either way.

3 The Problematic Presence of
Theology—General Concerns

In this section, we extend our argument by turning to gen-
eral reflections, rather than concrete cases, about the pres-
ence of theology in evidence-for-evolution sections of biol-
ogy textbooks. To drive home our argument, we will first
address three key objections.

First, a critic might point out that, even with our examples
of straw god, presumptive, and indeterminate theologies, it
still does not follow that God-talk in general is problematic
in biology textbooks. Even if there are some rotten apples
in the barrel, others may still be just fine. Can’t offending
authors just clean up their sloppy theological language and
get on with it?

Second, a critic might contend that authors can avoid our
concerns by casting theology aside or by making more de-
fensible theological claims. (We will address the suggestion
about setting theology aside in a later section.) Other-
wise, the path forward is for authors to give a defense of
what God would probably do, rather than on what he defi-
nitely ‘would’ do or merely ‘could’ do. The focus on God’s
probable actions, coupled with solid justification, is a mean
between the extremes of triviality and dogma. It allows
God-talk into the discussion in a defensible way.

Third, an alternative way forward is for textbook authors
to ask, ‘What do various versions of creationism claim
that God would probably do?’ This question is even more
tractable than the question of what God would probably do.
To answer this question, biologists do not have to moonlight
as theologians; they need not plumb the heavens, nor dis-
cern things eternal and unseen. Instead, they only need to
know what their creationist rivals claim about God.

In sum, the objections hold that (i) the ‘problem’ of theol-
ogy in biology textbooks is merely a matter of sloppy lan-
guage, (ii) this sloppiness can be dispensed with by focusing
on what God would probably do, or (iii), more modestly,
by focusing on what various creationists say God would
probably do. Taken collectively, these three objections at-
tempt to refute our overall contention that the presence of
theology in biology textbooks is worrisome.

By way of reply: there is much to be said on this score. An
initial note, mentioned earlier, is that we are not opposed in



52 Damned if You Do and Damned if You Don’t

principle to the presence of God-talk in biology textbooks.
We personally think that this approach has some merit.
But in what follows below, we argue that the presence of
theology comes at a significant cost, one that quite a few
textbook authors are likely unwilling to pay.

3.1 Rhetorical and Practical Concerns

We begin with objection three. It holds that textbook au-
thors ought to focus on what creationists themselves say
God probably would or would not do. We make two points
in reply. First, a number of biologists are concerned that di-
rect engagement with contemporary versions of creationism
(or intelligent design) may give students the faulty impres-
sion that these hypotheses are legitimate contenders to evo-
lutionary theory. Students may mistakenly come to think
that these views are worthy of serious consideration. By
analogy, would it be okay to give astronomy students the
impression that astrology is a real contender to modern as-
tronomy? To engage in any such discussion in a detailed
way would be to give astrology too much credit. As far as
we can tell, some textbook authors think the same concern
applies to creationism.65

Second, on a more practical level, textbook authors have
the laborious task of deciding just what versions of cre-
ationism (or intelligent design) they wish to engage. What
complicates matters is that not all versions are the same.
Different versions make use of a differing array of concep-
tual content, explanatory resources, auxiliary hypotheses,
and predictions. Some accept universal common ancestry,
others more limited ancestry; some accept a global deluge,
others see the flood as local; some accept an old Earth, oth-
ers are satisfied with a young one; some place great stock in
the power of selection and mutation, others accept a much
more limited view of natural causation. And so on. At a
minimum, wading through these differences requires a fair
amount of study. This is especially true given that partic-
ular arguments for evolutionary theory conflict with some,
but not all, versions of creationism. If textbook authors
include God-talk (or, more modestly, if they acknowledge
that some scientific facts logically imply the falsity of cer-
tain creationist claims), they should be clear on just which

65This may explain why some authors tamp down their treatment
of creationism (or of related metaphysical matters) in more recent
editions of their textbooks. The apparent strategy is to delegitimize
creationism or ID by giving them less air time. For example, see the
differences between Zimmer and Emlen, Evolution, first edition, p.
40, 42, 44, 318, 320 versus parallel passages in the second edition;
Miller & Levine Biology (2010) versus their earlier work, Kenneth
Miller and Joseph Levine, Biology: The Living Science (Lexington,
MA: D.C. Health & Co., 1994), 148-61, esp. p. 161; and, less so,
Futuyma, Evolution, third edition, p. 631-47 versus Futuyma and
Kirkpatrick, Evolution, fourth edition, p. 573-84.

arguments (or facts) impinge on which versions of creation-
ism. Yet from a practical point of view, one might protest
that many textbook authors have neither the time nor in-
terest to do so. That is precisely our point. The frequency
of “straw god” theology, for example, highlights this con-
cern in a very tangible way. Practically speaking, it’s not
at all clear (to us) that textbook authors are generally will-
ing or able to carry out the task in a sufficiently nuanced
manner.66

3.2 A Legal Concern

At the high school level, court rulings about the Establish-
ment Clause may add yet another layer of complexity to
the issues raised in all three objections above. While our
primary focus is on college instruction, it is worth mention-
ing that (public) high school biology textbooks must con-
tend with legal precedents in Epperson, McLean, Edwards,
Kitzmiller, and the like. It may be that some instances of
God-talk in the case for evolution run up against these le-
gal rulings.67 If that is true, then legal barriers hamper
any approach that wishes to draw on (or critique) certain
theological propositions. It has been quipped that a com-
petent lawyer armed with these cases could go a long way
toward getting the Origin of Species banned from public
high school biology classrooms. (Darwin included theologi-
cal claims in his “one long argument” for evolution, as noted
below.) Strikingly, the same might be said for parts of
the evidence-for-evolution sections of current biology text-
books. Perhaps organizations like the National Center for
Science Education ought to take up the cause.68

3.3 An Epistemological Concern

Shifting ground now, recall objection 2 above. It held that
authors can legitimately include theology in their argu-
ments for evolution by giving some principled grounds for
what God would ‘probably’ do in organic history. This
move is a solid step beyond mere assertions about what
God ‘would’ or ‘could’ do. In this case, authors are not
borrowing creationists’ theological tenets (as per objection
3); instead, they are bringing their own theological claims
to the table. So the question is, what is the justification for

66As we noted earlier, textbook authors need not canvass every
species of creationism or intelligent design. Nonetheless, in general
we are not optimistic that authors will have the time or interest to
cover even mainstream rivals in adequate detail.

67See Luskin, “Zeal for Darwin’s House Consumes Them”; Luskin,
“Darwin’s Poisoned Tree.”

68For more on the NCSE and various legal cases, see their web-
site: https://ncse.com/library?f%5B0%5D=taxonomy_vocabulary_
14%3A289.



Volume 1, Issue 2

3. THE PROBLEMATIC PRESENCE OF THEOLOGY—GENERAL CONCERNS 53

these authors’ particular claims about God? Do they have
any special insight concerning what the Almighty is likely
to have done in organic history?

These questions become more poignant for authors who do
not accept that God somehow planned or guided the evo-
lutionary processes.69 On this view, human beings are not
the result of a divinely-ordained plan. More directly, hu-
mans were not created by God in order to know God (in
some sense) but were produced by mindless natural forces,
such as random mutation and natural selection, that sim-
ply enabled them to survive and reproduce on the African
savannah. In fact, it may be the case that, given this view
of evolution, it’s very difficult to say that humans have the
kind of cognitive equipment that is suitable to do counter-
factual theology. Did we really evolve cognitive powers to
know (a priori) true subjunctive theological claims about
what an all-powerful, perfectly free deity would probably
do at distant episodes in the ancient past? Of course, it’s
possible that our lineage evolved this ability. But is it prob-
able? It’s hard to say. And that’s just the point.

Darwin concluded as much in his mature reflections. Late
in life, when trying to reason about the existence of God, he
drew himself up short: “But then arises a doubt—can the
mind of man, which has, as I fully believe, been developed
from a mind as low as that possessed by the lowest animal,
be trusted when it draws such grand conclusions?”70 Else-
where he lamented, “A dog might as well speculate on the
mind of Newton.”71 Darwin, of course, is not alone in this
sentiment.72 On an unguided view of evolution, it is likely
inscrutable or improbable that human beings can do such
theology. If we don’t have cognitive access to such claims,
then we are not justified in using such claims in arguments
for evolution. This means that, if a non-theistic version
of evolutionary theory is correct, then theology-laden ar-
guments for evolution are illegitimate. We have reached
beyond our ken. So, pace objection 2, we have no legiti-
mate grounds upon which to say, “God would probably do
such-and-such” in organic history.

69See the brief arguments along these lines in Dilley, “Charles Dar-
win’s use of theology”; Dilley, “Nothing.”

70Charles Darwin, The Autobiography of Charles Darwin 1809-
1882, ed. Nora Barlow (New York: W.W. Norton & Co., 1958), p.
92-93.

71Francis Darwin, The Life and Letters of Charles Darwin (London:
John Murray, 1887), vol. 2, p. 312. Darwin does not say in this letter
that his theological muddle arose because of his theory of evolution.
That connection became explicit later in his autobiography.

72Patricia Churchland, “Epistemology in the Age of Neuroscience,”
Journal of Philosophy, vol. 84, no. 10 (1987): 544-53; Michael Ruse,
“Belief in God in a Darwinian Age,” The Cambridge Companion to
Darwin, J. Hodge and G. Radick, eds. (New York: Cambridge Univer-
sity Press, 2003): 368-92. See also Thomas M. Crisp, “On Naturalistic
Metaphysics,” The Blackwell Companion to Naturalism, Kelly James
Clark, ed. (Hoboken, NJ: John Wiley & Sons, Inc., 2016), 61-74.

Our deeper concern, of course, is not just with objection
2. Instead, our epistemological worry casts doubt on an
array of theology-laden arguments for evolution. When-
ever textbook authors bring their own partisan theology
to bear—whether straw god, presumptive, or something
else entirely—they run the risk of relying on unjustified
premises. If unguided evolution is true, these arguments
fail. (Recall that over 60% of the textbooks on our list use
presumptive theology. That percentage increases when we
consider other types of God-talk.) Even more pressing, any
textbook that uses its own partisan theology falls prey to
the same dynamic. In a profound way, unguided evolution
erodes some of its own foundation. For those of this ilk, the
presence of theology is indeed problematic.

3.4 A ‘Science and Religion’ Concern

Another significant cost arises when we consider two widely-
known models of the relationship between science and reli-
gion. Both models posit something of a ‘separation’ be-
tween science and religion; this creates problems for all
three objections above. The first model, Stephen Jay
Gould’s “non-overlapping magisteria” (NOMA), posits that
science and religion “do not overlap.”73 Science “covers the
empirical realm” whereas religion “extends over questions
of ultimate meaning and moral value.”74 A second model,
complementarity, holds that science and religion can over-
lap in the sense of studying the same phenomena, but do so
at complementary levels. Given that science and religion al-
ways function at different levels, they maintain a principled
level of separation.75 Collectively, these two models hold (or
imply) that (i) the propositional content of theology cannot
affect the epistemic justification of a given scientific hypoth-
esis or theory. That is, theology can’t be used as evidence
for or against scientific claims. (ii) Likewise, scientific theo-
ries and evidence cannot impact the epistemic justification
of any religious belief. That is, scientific claims cannot sup-
port or refute religious claims. And, (iii) theological claims
cannot function as premises in a scientific argument. The-
ology must remain separate from science. What man has
cast asunder, let no one join together.

Yet two problems arise. First, if either of these models is
correct, then all theology-laden arguments for evolution no
longer belong in biology textbooks—particularly in sections
that give the scientific “evidence for evolution.” Claims
about ‘what God would probably do’ (whether from cre-

73Stephen Jay Gould, Rocks of Ages: Science and Religion in the
Fullness of Life (New York: Ballantine Books, 1999).

74Gould, Rocks of Ages, 6.
75For example, Denis R. Alexander’s brief, “Models for Relating Sci-

ence and Religion,” Faraday Report No. 3 (Cambridge, UK: Faraday
Institute for Science and Religion), 4.



54 Damned if You Do and Damned if You Don’t

ationists or others) have no relevance to scientific justifica-
tions for evolution. As such, a lot of textbooks on our list
ought to eschew some of their own arguments.76

Second, if either model is correct, then scientific evidence
is powerless to critique creationism (given that it is a
theology-laden hypothesis). It is also powerless to favor evo-
lution over creationism. Phenomena like anatomical simi-
larities, vestigial organs, pseudogenes, and nested hierar-
chies, have nothing to say about the plausibility of evolu-
tion over creationism; nor do they even touch creationism.
We will return to these crucial problems later. For now,
the point is that, under NOMA or complementarity, text-
books cannot use scientific evidence against creationism nor
can they use theology as evidence for evolution. The cost
of separation is high: by sequestering God, one limits the
reach of science.

3.5 Methodological Concerns

One last problem remains for all three objections.77 By
some lights, the presence of theological claims as part of ar-
guments for evolution run contrary to the scientific method
itself. To see why, consider that vast numbers of scientists
accept “methodological naturalism” as an essential feature
of science.78 Methodological naturalism is roughly the idea
that scientific explanation, argument, testing, research, and
articulation should invoke only natural laws, processes, or

76See the “Separation/HM” column of Figure 1.
77The argument that follows has been developed in Dilley, “How to

Lose a Battleship.”
78For example, Eugenie Scott, Evolution vs. Creationism (Berke-

ley, CA: University of California Press, 2004), xi, 3, 50-51, 249-54;
Francis Collins, The Language of God (New York: The Free Press,
2006), 165–166; Robert O’Connor, “Science on Trial: Exploring the
Rationality of Methodological Naturalism,” Perspectives on Science
and Christian Faith 49 (March 1997): 15–30; Darrel Falk, Com-
ing to Peace with Science (Downers Grove, IL: InterVarsity Press,
2004), 39; Kathryn Applegate, “A Defense of Methodological Nat-
uralism” PSCF 65, no 1 (March 2013): 37–45; Keith B. Miller,
“An Evolving Creation: Oxymoron or Fruitful Insight?” Perspec-
tives on Evolving Creation, ed. Keith B. Miller (Grand Rapids,
MI: Eerdmans, 2003), 7; Conor Cunningham, Darwin’s Pious Idea
(Grand Rapids, MI: Eerdmans, 2010), 265; Denis Alexander, Cre-
ation or Evolution: Do We Have to Choose?, rev. and expanded
ed. (Grand Rapids, MI: Monarch, 2014), 216–218; Holmes Rol-
ston III, Denis Alexander, Jeff Schloss et al., “The Concept of ‘In-
telligent Design’,” The International Society for Science and Reli-
gion, 2011, accessed March 28, 2017, http://www.issr.org.uk/issr-
statements/concept-intelligent-design/; Kenneth Miller, Finding
Darwin’s God (New York: HarperCollins, 1999), 167–169, 218–219,
239–243; and Miller, Only a Theory (New York, Viking, 2008), 185–
187; Ian Barbour, “Science and Scientism in Why Religion Matters,”
ed. Huston Smith, Zygon 36, no. 2 (June 2001): 207–214, esp. 209–
210; Richard T. Wright, Biology through the Eyes of Faith, rev. and
updated ed. (New York: HarperCollins, 2003), 31–51, 74–75; Karl
Giberson, Saving Darwin (New York: HarperCollins, 2008), 159–160.

entities rather than supernatural agents, entities, or pro-
cesses.79 While religious ideas may be a source of scien-
tific inspiration for some scientists, scientific discourse itself
should not use any religious ideas or language. This directly
implies that scientific arguments for evolution should not
use theology-laden claims. God-talk is not permissible as
a premise in any scientific argument for evolution. It is a
violation of the scientific method, therefore, to use premises
such as ‘God would do X’ or ‘God can do X’ or ‘God would
probably do X’ or the like. Theology may be legitimate in
its own domain, and it may even overlap with objects or
processes studied by science, but theological claims are not
appropriate within scientific research and discourse proper.

The problem, of course, is that, if methodological natural-
ism is a necessary feature of modern science (or of the mod-
ern scientific method), as many believe, then any theology-
laden argument for evolution automatically falls outside the
bounds of science. They are beyond the pale. This is true
across the board, from ‘good’ theology to ‘bad’ theology. A
given theological claim may be plausible or implausible; it
may be well-defined or nebulous; it may have long-standing
precedent in an ancient tradition or may be brand new from
HarperCollins. It doesn’t matter. Any appeal to supernat-
ural agents, entities, or processes is banned in toto. This
means that all of the theology-laden arguments discussed in
this paper—as well as others discussed elsewhere—have no
place in scientific discourse and research. Pretty clearly,
if methodological naturalism is canonical, then all God-
talk ought to be excluded from biology textbooks’ scientific
case for evolution. Otherwise, the case for evolution runs
counter to the scientific method itself. And that is no small
thing.

Just as troubling, if methodological naturalism is canoni-
cal, it also means that, within the context of science, empir-
ical evidence cannot refute any theology-laden hypothesis
or theory. Given that theology is barred from scientific dis-
course, it cannot enter into this discourse long enough to
be tested and falsified. As with NOMA and complementar-
ity, methodological naturalism mandates that evidence of
molecular sequences, biogeographical distribution, embry-
ological similarity, and the like can never count as scien-
tific evidence against any God-based claim, no matter what
these data are. This, too, is problematic: science effectively
loses its straightforward implications.

*
79The definition given is known as intrinsic methodological natural-

ism. Another, more mild version is so-called provisional methodolog-
ical naturalism. For reasons why provisional methodological natural-
ism fails, see Dilley, “How to Lose a Battleship,” 620–21.



Volume 1, Issue 2

4. THE ABSENCE OF THEOLOGY IS ALSO PROBLEMATIC 55

Stepping back for a moment, it is important to note that
the power and relevancy of the problems explored above
vary depending upon what a given textbook says or, more
generally, what a given textbook author (or authors) take
to be important. For example, an author who is not com-
mitted to methodological naturalism would avoid some of
problems above. As such, our list of concerns is not meant
as a ‘one size fits all’ critique of every textbook on our list.
Instead, it is a general tour of the problems that require
reckoning. And, as we observe in Figure 1 and in our foot-
notes, a number of these problems apply in spades to many
textbooks we have studied.

Recall now the three objections raised at the beginning of
this section. They held, respectively, that (i) the ‘problem’
of theology in biology textbooks was merely a matter of
sloppy language, (ii) this sloppiness can be dispensed with
by focusing on what God would probably do, or (iii), more
modestly, by focusing at least on what various creationists
say God would probably do. Yet if our argument is cor-
rect, these objections falter. Instead, rhetorical, practical,
legal, epistemological, demarcational, and methodological
considerations all collectively ratchet up the price of includ-
ing theology in textbooks’ arguments for evolution. While
some textbook authors may be willing to accept these li-
abilities, for others they amount to a pound of biological
flesh.

4 The Absence of Theology is Also
Problematic

Having raised a number of worries about the presence of
theology in arguments for evolution in biology textbooks,
we now turn in the opposite direction. We argue that avoid-
ing theology in these contexts is also problematic. This
leads directly to the dilemma that we discuss further in
Section 5. For now, we argue that there is a high cost to
the absence of God-talk in biology textbooks. Some of the
arguments we develop below are on the ‘other side of the
coin’ to those articulated in Sections 2 and 3. Readers will
notice that they have a parallel feel, but are developed from
a different direction.

To make our case, we will first raise three objections that
a critic might have in mind. In the course of answering
these objections, we will lay out our positive reasons why
the exclusion of God-talk is undesirable for a number of
textbooks.

The first objection contends that theology is merely a dis-
pensable foil. That is, a critic might think that textbook

authors use God-talk only for rhetorical effect; the ‘real’ ev-
idence for evolution centers on purely natural phenomena,
like homological similarities, molecular sequences, nested
hierarchies, and the like. At most, creationism (and its asso-
ciated theology) is just a historical artifact that is irrelevant
to the true justification of evolutionary theory, especially in
the present day.

Second, a critic might say that theology has no place within
science. On this view, science is governed by methodologi-
cal naturalism, NOMA, complementarity, or the like. These
approaches accept some version of the ‘separation’ the-
sis: science cannot address religious claims, or such claims
are not appropriate within scientific research or discourse
proper.80

Third, a critic might alternatively contend that textbooks
do not even need to take a principled stance on methodolog-
ical naturalism, NOMA, complementarity, or any version of
the separation thesis. Each of these make some pronounce-
ment about theology (e.g., ‘it occupies a separate magis-
terium than science’). Instead, why not just be silent on
the matter? The path forward is to make no pronounce-
ments at all. Just ignoring theology entirely.81

For brevity’s sake, we will label these as (i) the periphery
objection, (ii) the separation objection, and (iii) the silence
objection, respectively.

4.1 Evidence and Background Beliefs

One initial concern about all three objections is that, for
many people, they do not adequately take into account the
broader context of inquiry. In a narrow sense, the origi-
nal inquiry is a seemingly simple question: Is evolutionary
theory true? To answer this question, textbooks provide
various lines of evidence. (Hence, the ubiquitous “evidence
for evolution” sections.) Yet the matter becomes imme-
diately complicated by the fact that evidence is typically
relative to a set of background beliefs. What counts as evi-
dence for one person, given her background beliefs, may not
count as evidence for another person, given his background
beliefs. Thus, background beliefs are in play when asking
about the truth (and justification) of evolutionary theory.
In the context of the Western tradition and American cul-
ture, claims about God’s alleged actions in organic history
form key elements of some people’s background beliefs. In-

80See Figure 1 for a full list of textbooks that accept the separation
thesis (or halfway measures, a less overt version of the separation
thesis. See our discussed below).

81The best example of this on our list is Gunstream, Explorations
in Basic Biology. Hillis et al., Principles of Life apparently tries to be
silent on all things theological as well, but perhaps less successfully.



56 Damned if You Do and Damned if You Don’t

deed, millions have held, and continue to hold, creationist
beliefs of one kind or another. Moreover, many non-theists
are in a similar epistemic position: some of them accept evo-
lution in part because of theology-laden arguments.82 (We
have seen some of these arguments in this article; there are
more as well—for example, ‘God would never design a sub-
optimal panda’s thumb, but an imperfect structure is just
what we’d expect on natural selection.’) More broadly, as
Cornelius Hunter has shown, theological claims have been
central to the debate on biological origins for centuries.83
In fact, the contest between natural and supernatural ex-
planations of the physical world has been embedded in the
Western tradition since its inception. As Cambridge clas-
sicist David Sedley has observed, the matter was consid-
ered “fundamental” by ancient thinkers like Socrates, Plato,
Aristotle, Anaxagoras, Empedocles, Democritus, the Epi-
cureans, and the Stoics.84 The melee between natural and
supernatural explanations continues to the present day, es-
pecially concerning matters of the origin of the universe,
life, and the human mind. So, for many people, theology-
laden background beliefs are crucial to evaluating the case
for evolution. Thus, it is simplistic to hold, as the objec-
tions do, that theology is peripheral to the discussion, or
science and theology are to remain separate, or discussions
of evolution can just ignore theology altogether. For many,
the seemingly simple question, “Is evolution true?” can only
be answered by taking into account the divine.

4.2 The Failure of Halfway Measures

A parallel point concerns the ‘halfway measure problem.’
Halfway measures, as we use the term, are attempts to eval-
uate the empirical content of a theology-laden hypothesis,
but only after separating it from its theological moorings.85
The idea here is that textbooks can successfully make their
case for evolution by ‘sticking to the facts’ without ventur-
ing into God-talk. This approach is very much in accord
with the separation, silence, and periphery objections.

Consider, for example, Miller & Levine Biology.86 In their
presentation of the case for evolution, Miller and Levine
avoid all mention of God, special creation, young-Earth
creation, intelligent design, and the like. Indeed, even in

82As noted in Dilley, “Nothing,” (p. 784), some atheists and agnos-
tics have very strong beliefs about what actions in organic history are
befitting of God, were He to exist.

83Hunter, “Darwin’s Principle”; Hunter, Science’s Blind Spot.
84David Sedley, Creationism and Its Critics in Antiquity (Berkeley:

University of California Press, 2007), xvi.
85Ironically, this strategy was championed by some modern cre-

ationists themselves. See Numbers, The Creationists, 7, 268-85. For
Ridley’s halfway measure, for example, see Ridley, Evolution, p. esp.
43-70, esp. 44, 67-68.

86This text is one of the top high-school biology titles.

their historical recounting of the Origin, they state that
Darwin’s feat was to overthrow the view that species are
fixed and the Earth is young—never mentioning creation-
ism at all!87 Evidently, Miller and Levine are quite serious
when they say, “Scientific endeavors never concern, in any
way, supernatural phenomena of any kind.”88

But the matter is not so easy. It turns out that ‘empiri-
cal facts’ don’t just stick to themselves; they also stick to
theology. For example, Miller and Levine state that Dar-
win’s “contribution to science” helped falsify claims that the
Earth is young and that species are fixed.89 They point out,
for example, that modern geology has shown the Earth to
be ancient:

Geologists now use radioactivity to establish the
age of certain rocks and fossils. This kind of data
could have shown that Earth is young. If that
had happened, Darwin’s ideas would have been
refuted and abandoned. Instead, radioactive dat-
ing indicates that Earth is about 4.5 billion years
old—plenty of time for evolution by natural selec-
tion to take place.90

So, according to Miller and Levine, the Earth is about 4.5
billion years old. Yet, if this claim is true, then any claim
incompatible with it must be false. That is, let us plausibly
suppose the following is true:

1. The Earth originated 4.5 billion years ago.

The truth of this claim entails the falsity of a competing
claim—namely:

2. The Earth originated 6,000 to 10,000 years ago.

And, the falsity of (2) entails the falsity of third claim:

3. The Earth originated 6,000 to 10,000 years ago by a
direct act of God.

The logic of these entailments is inescapable. If (1) is true,
then (3) must be false. In effect, Miller and Levine have
adopted a halfway measure in order to avoid the appearance

87Miller and Levine, Miller & Levine Biology, p. 450-64, esp. 453-
54.

88Miller and Levine, Miller & Levine Biology, p. 5.
89Miller and Levine, Miller & Levine Biology, p. 450-53.
90Miller and Levine, Miller & Levine Biology, p. 466.



Volume 1, Issue 2

4. THE ABSENCE OF THEOLOGY IS ALSO PROBLEMATIC 57

of evaluating a theology-laden claim. But this appearance
is a façade. The plain reality is that the truth of evolu-
tionary theory and its tenets logically entails the falsity of
any theory that posits contrary claims. It doesn’t matter
whether the theory in question includes supernatural beings
or not.91 It also doesn’t matter if the theory is ‘supposed’
to be in a separate domain. A fact is a fact; any claim to
the contrary is false. Accordingly, it is simplistic to issue an
unnuanced pronouncement, as Miller and Levine do, that
“[s]cientific endeavors never concern, in any way, supernat-
ural phenomena of any kind.” The direct implications of
their own scientific assertions say otherwise.92 More deeply,
it is likewise simplistic to claim that biology textbooks can
‘stick to the empirical facts’ and leave theological consider-
ations aside in their case for evolution. In the end, the truth
of certain empirical facts logically mandates the falsity of
certain theological claims.93

Combined with our discussion about background beliefs,
this consideration sharpens the problems with all three ob-
jections, especially the ‘separation’ and ‘silence’ objections.
For example, all versions of the ‘separation’ thesis hold that
scientific claims cannot affect the plausibility of religious
claims. The duo are said to occupy different domains (or
complementary levels). Yet in light of American culture
and the Western tradition, for many people, the data of
an ancient Earth do affect the plausibility of claims about
God’s purported action 10,000 years ago. This is true not
just of many evolutionists, but also for many young-Earth
creationists; they recognize the basic logical dichotomy in

91To be clear, our point is not that Miller and Levine are tacitly
“doing theology” in their textbook. Instead, our point is that they are
doing science. Like it or not, their scientific claims have undeniable
implications for the truth or falsity of some other claims, including
some theological claims.

92Surprisingly, in another textbook, Miller and Levine state: “Dar-
win knew that accepting his theory required believing in philosophical
materialism, the conviction that matter is the stuff of all experience
and that all mental and spiritual phenomena are its by-products.”
Philosophical materialism rejects the existence of God, gods, spirits,
non-reductive souls, the One, Atman is Brahman, and the like. Ap-
parently, then, the direct implication of Darwinian evolution is that
virtually every major religion is false. That sounds rather unlike the
claim that “[s]cientific endeavors never concern, in any way, supernat-
ural phenomena of any kind.” See Miller and Joseph, Biology: The
Living Science, 148-61, esp. p. 161, original emphasis. One also
wonders what Kenneth Miller was up to when he argued that radio-
metric data counters young-Earth creationism in Finding Darwin’s
God (New York: HarperCollins, 1999), 57-80.

93Of course, a critic can avoid this conclusion by maintaining, for
example, that there are different levels (or types) of truth. (Note that
this is much different than the claim that there are different theories
of truth.) For problems with this view, see Bradley Monton, Seeking
God in Science: An Atheist Defends Intelligent Design (Peterbor-
ough, Ontario: Broadview Press, 2009), chapter 2. Other attempts to
avoid our conclusion also incur additional problems: cf. John Worrall,
“Science Discredits Religion,” in Contemporary Debates in Philosophy
of Religion, Michael L. Peterson and Raymond J. VanArragon, eds.
(Malden, MA: Blackwell Publishing, 2004), 59-72, 87-90, esp. 59ff.

play: either ancient Earth data are correct or their view is
correct, but not both. They simply believe that they have
better grounds to accept the latter rather than the former.94
More generally, wherever one falls on the dichotomy, the
point here is that many people have theology-laden back-
ground beliefs about biological origins, and they also rec-
ognize the logical incompatibility of some scientific claims
with some theological claims. For this group, halfway mea-
sures are a chimera.

Of course, some critics disagree. They maintain an un-
yielding form of the separation thesis (or of the silence or
periphery objections). These individuals obviously hold dif-
ferent background beliefs than those mentioned above; they
also deny that the logical incompatibility of some empiri-
cal data and certain theological claims is of much concern.
Science, when rightly done, stays within its own realm; re-
ligion, when rightly interpreted, likewise minds its place.
Neither impinge on the plausibility of the other.

By way of reply: there is, unfortunately, a high price to be
paid for this approach. As we will explore more below, if
science does not impinge upon theology, then scientific data
cannot impinge upon the truth or falsity of any hypothesis
about God’s alleged actions in organic history. Textbooks
cannot say, then, that scientific evidence disconfirms young-
Earth creationism. More generally, they cannot say that
scientific evidence favors evolution over creationism. Ap-
parently, the data of embryology, biogeographical distribu-
tion, vestigial structures, and the like are of little or no use
to show the empirical superiority of evolution over its su-
pernatural rivals. Scientific evidence never crosses into the
religious domain with any force. Instead, it is impotent. As
mentioned, we will return to this point in due course. For
now, we simply want to point out that maintaining any of
the three objections, along with halfway measures, includes
a significant cost.95

94Even if one allows that philosophical ideas like the “appearance of
age” and “uniformitarianism,” rather than empirical data, are highly
relevant to testing young-Earth creationism, the empirical data still
remain vital to the discussion. After all, the “appearance of age” and
“uniformitarianism” become relevant precisely because the empirical
data seem to run counter to a young Earth. If the data were the
reverse, there would be no need to defend the “appearance of age” or
to attack “uniformitarianism.”

95Some critics might protest that the best form of the separation
thesis allows scientific evidence to affect some, but not all, theological
claims. It only informs those that are incorrect interpretations of a
given religious text. So, for example, science can in principle falsify
young-Earth creationism given that, on this view, young earth claims
are typically taken to be an incorrect interpretation of the Bible. The
benefit of this version of the separation thesis is that it allows science
to counter incorrect theologies, but (apparently) it cannot touch cor-
rect theology (whatever it happens to be). By way of reply: we quite
agree that some religious claims are beyond the purview of science
(e.g., religiously-oriented ethical claims about what humans ought to
do). But this insight is compatible with models of science and theol-



58 Damned if You Do and Damned if You Don’t

Stepping back, if we are correct about our general argu-
ment in this section, then it is implausible to say—at least
for many people—that theology is ‘peripheral’ to the jus-
tification of evolution. It is also implausible to say that
science has no epistemic implications for religious claims or
that simply being silent settles the matter in a satisfactory
way. For many, God-talk is simply too relevant to ignore.

4.3 Mind-World Affinity

But the well goes deeper. Evidence has emerged in the
last few decades that human beings are hardwired for be-
lief in the gods and in the design of some of the features
of the natural world. For example, one Oxford-led analysis
involved 57 researchers who conducted 40 separate stud-
ies in 20 different countries, including countries that were
traditionally theistic as well as others than were more sig-
nificantly atheistic. The study concluded that humans are
“predisposed” to believe in gods and an afterlife.96 Other
research indicates that preschool and elementary aged chil-
dren naturally ascribe the origins of certain objects in terms
of their function (‘this was made to do that’) and construe
objects and events as intentionally caused (‘someone made
this’). By 6-10 years, kids connect biological functionality
in nature with “goal-directed design.”97 As Alison Gop-
nik observes, “By elementary-school age, children start to
invoke an ultimate God-like designer to explain the com-
plexity of the world around them—even children brought

ogy that reject the separation thesis (e.g., the concord model). If the
separation thesis is to be meaningful at all, it must claim that theo-
logical claims that touch the natural world in a significant way are,
if correctly interpreted from Scripture, beyond the reach of science.
But we wonder whether this can really be decided prior to looking at
the empirical evidence itself. It seems possible in principle, for exam-
ple, for archeologists to find evidence that confirms, to one degree or
another, that Jesus existed (say, ancient inscriptions, ossuaries, struc-
tures, settlements, or the like that correspond to key events, people,
and places in biblical accounts of the life of Jesus). All things be-
ing equal, this would count as confirming, even if slightly, a major
claim of the New Testament: namely, that Jesus lived in first-century
Palestine. On the other side of the coin, is seems possible in principle
for archeologists to find evidence to the contrary (say, by finding a
systematic pattern of error in Bible accounts of first-century places,
geography, people groups, events, etc. that are central to the given
descriptions of the life of Jesus). Thus, in our view, the ‘partial’ ver-
sion of the separation thesis draws arbitrary boundaries around what
religious claims can or cannot be affected by science. See also note
119.

96Justin Barrett, Cognitive Science, Religion, and Theology (West
Conshohocken, PA: Templeton Press, 2011); Justin Barrett, Born
Believers: The Science of Childhood Religion (New York: Free
Press, 2012); see also Oxford University’s press release, “Hu-
mans ‘Predisposed’ to Believe in Gods and the Afterlife,” 16
May 2011, available at: https://phys.org/news/2011-05-humans-
predisposed-gods-afterlife.html.

97Deborah Kelemen et al., “Young Children can be Taught Basic
Natural Selection Using a Picture-Storybook Intervention,” Psycho-
logical Science, vol. 25, no. 4 (2014): 894.

up as atheists.”98

Even veteran scientists, habitually trained to favor natu-
ralistic explanations, cannot escape teleological thinking.99
Psychology professor Deborah Kelemen summarizes these
findings: “Even though advanced scientific training can re-
duce acceptance of scientifically inaccurate teleological ex-
planations, it cannot erase a tenaciously early-emerging hu-
man tendency to find purpose in nature.”100 If this is our
natural way of thinking, then, at a very practical level, it
will be exceedingly difficult to eradicate design-like reason-
ing in biology. And this will be true not just for theists,
but for non-theists as well. From a cognitive point of view,
the notion that theology can simply be avoided—especially
in the context of biological origins—is psychologically im-
plausible.101

It comes as little surprise, then, that even ardent evolution-
ary biologists wrestle with design-based thinking.102 Fran-
cis Crick’s admission is well known: “Biologists must con-
stantly keep in mind that what they see was not designed,
but rather evolved.”103 And Richard Dawkins echoes this
sentiment from the opposite direction: “It is almost as if
the human brain were specifically designed to misunder-
stand Darwinism, and to find it hard to believe.”104 The

98Alison Gopnik, “See Jane Evolve: Picture Books Ex-
plain Darwin,” Wall Street Journal, 18 April 2014, avail-
able: http://www.bu.edu/cdl/files/2014/04/WSJ-Teaching-Tots-
Evolution-via-Picture-Books-WSJ.com_.pdf. See also Rebekah A.
Richert and Justin L. Barrett, “Do You See What I See? Young Chil-
dren’s Assumptions about God’s Perceptual Abilities,” The Interna-
tional Journal for the Psychology of Religion, vol. 15, no 4 (2005):
283-95.

99Deborah Kelemen, Joshua Rottman, and Rebecca Seston, “Pro-
fessional Physical Scientists Display Tenacious Teleological Tenden-
cies: Purpose-Based Reasoning as a Cognitive Default,” Journal of
Experimental Psychology: General, 15 October 2012, advance online
publication: doi: 10.1037/a0030399.
100Art Jahnke, “The Natural Design Default,” Bostonia (Winter-

Spring 2013): 22-23, esp. 23.
101See the penetrating argument along similar lines by Del Ratzsch,

“Humanness in Their Hearts: Where Science and Religion Fuse,” The
Believing Primate, eds. Jeffrey Schloss et al. (Oxford, UK: Oxford
University Press, 2009), 209-45.
102For example, Bruce Alberts, former president of NAS: “Why do

we call the large protein assemblies that underlie cell function protein
machines? Precisely because, like the machines invented by humans
to deal efficiently with the macroscopic world, these protein assem-
blies contain highly coordinated moving parts. . . [just as] a machine of
our common experience.” Bruce Alberts, “The Cell as a Collection of
Protein Machines: Preparing the Next Generation of Molecular Biol-
ogists,” Review Issue: Macromolecular Machines, Cell 92 (6 February
1998): 291, italics in original. See also Annie Crawford’s helpful anal-
ysis of the defenses of teleological language in biology by Ernst Mayr
and Michael Ruse, respectively: Crawford, “Metaphor and Meaning
in the Teleological Language of Biology,” MA thesis, Houston Baptist
University, 13 August 2018.
103Francis Crick, What Mad Pursuit (New York: Basic Books 1990),

138.
104Richard Dawkins, The Blind Watchmaker (New York: W.W. Nor-

ton and Company, 1996), xi.



Volume 1, Issue 2

4. THE ABSENCE OF THEOLOGY IS ALSO PROBLEMATIC 59

‘design temptation’ no doubt arises in part because of the
extraordinary complexity of biological phenomena. Crick
and Dawkins (and many other evolutionists) acknowledge
that much of the world appears to be designed. Of course,
they think this is no actual design beneath it all. But the
language of ‘appearance’ is itself significant. On their view,
the mesmerizing flurry of a hummingbird’s wings and the
delicate blush of an orchid look like artifacts of mind prima
facie.

This sentiment becomes especially significant when tied to
the psychological studies on human cognition just men-
tioned: the biological world looks designed and the hu-
man mind naturally tends toward design-based explana-
tions. The organic realm and the human mind fit together
like jigsaw pieces—at least if one accepts the self-reports
of evolutionists as well as recent research on human cogni-
tion. This apparent mind-world affinity, when applied to
the present case, suggests that it is simplistic to claim, as
the three objections above do, that theology is peripheral
to some of the arguments for evolution, or that science and
religion are separate, or that textbook authors can manage
the matter by saying nothing at all. The human mind, the
appearance of design, and the close connection between the
two indicate otherwise. Even more than the background
beliefs supplied by American culture and the Western tra-
dition, this ostensible mind-world affinity shows the virtual
inevitability of theology in discussions of biological origins.

4.4 Arguments for Evolution Cast Aside

The absence of theology is problematic for another reason.
From the Origin to the present, biologists have repeatedly
invoked God-talk as part of their positive case for evolu-
tionary theory. If theology is barred (or ignored), then this
array of justifications goes by the wayside. Consider what
this means. In the first place, the Origin itself is utterly un-
intelligible without theological language. Darwin’s primary
objective was to show the superiority of evolution by natu-
ral selection over special creation.105 His repeated attacks
on this view, as well as on other versions of creationism,
are explicit and unmistakable.106 Moreover, as scholars
have shown, Darwin’s conceptualization and justification
of evolutionary theory itself include striking theological el-
ements.107
105Charles Darwin, On the Origin of Species (London: John Murray,

1859), p. 1-6.
106Darwin, Origin, 3, 6, 44, 55, 59, 95, 115, 129, 133, 138, 139, 152,

155, 159, 162, 167, 185, 186, 188, 194, 203, 244, 275, 303, 315, 352,
355, 365, 372, 389, 390, 393-94, 396, 398, 406, 413-14, 420, 434-35,
437, 453, 456, 465, 469, 470-71, 473-75, 478, 480-83, 486, and 488.
107John Brooke, “The Relations between Darwin’s Science and His

Religion,” Darwinism and Divinity, ed. John Durant (New York:

Second, a number of prominent biologists rely on theology
in their scientific case for evolution in the present day. They
contend that evolution better accounts for the data in part
because a respectable deity would never create a subopti-
mal organ, for example, or would always create new species
from scratch, or the like. Biologists who champion these ar-
guments include luminaries such as Theodosius Dobzhan-
sky, Niles Eldredge, Douglas Futuyma, John Avise, Neil
Shubin, Jerry Coyne, Richard Dawkins, George Williams,
Stephen Jay Gould, Francis Collins, Kenneth Miller, De-
nis Alexander, and many others.108 Their theology-laden

Oxford University Press, 1985), 40–75, esp. 48–49; Gillespie, Charles
Darwin and the Problem of Creation; Richard England, “Natural Se-
lection, Teleology, and the Logos,” Osiris 16 (2001): 270-287, esp.
274-275; Dov Ospovat, “God and Natural Selection,” Journal of the
History of Biology 13, no. 2 (Sept. 1980): 169-194; Dov Ospo-
vat, “Darwin’s Theology,” review of Neal Gillespie’s Charles Darwin
and the Problem of Creation,” Science 207, no. 4430 (Feb 1, 1980):
520; Dov Ospovat, The Development of Darwin’s Theory (Cambridge:
Cambridge University Press, 1981), 223-224; Momme von Sydow,
“Charles Darwin: A Christian Undermining Christianity?” in Science
and Beliefs: From Natural Philosophy to Natural Science, 1700-1900,
eds. D. M. Knight and M. D. Eddy (Burlington, VT: Ashgate, 2005),
141-156; John Cornell, “God’s Magnificent Law: The Bad Influence of
Theistic Metaphysics on Darwin’s Estimation of Natural Selection,”
Journal of the History of Biology vol. 20, no. 3 (Fall 1987): 381-
412; Dilley, “Charles Darwin’s use of theology,” 29-58; John Cornell,
“Newton of the Grassblade? Darwin and the Problem of Organic Tele-
ology,” Isis 77, no. 3 (Sept. 1986): 405-421; James Moore, The Post-
Darwinian Controversies (New York: Cambridge University Press,
1979), 318; Robert J. Richards, “Theological Foundations of Darwin’s
Theory of Evolution,” in Experiencing Nature, eds. P.H. Theerman
and K.H. Parshall (Dordrecht: Kluwer Academic Pub., 1997), 61-79.
108Donald Prothero, Evolution (New York: Columbia University

Press, 2007), 30–49, esp. 37–39; Theodosius Dobzhansky, “Nothing in
Biology Makes Sense Except in the Light of Evolution,” The Amer-
ican Biology Teacher (March 1973): 125–129; Stephen Jay Gould,
Ever Since Darwin (New York: W. W. Norton, 1977), 91–96; Gould,
The Panda’s Thumb (New York: W. W. Norton, 1980), 20–21, 24,
28–29, 248; Gould, Hen’s Teeth and Horse’s Toes (New York: W.
W. Norton, 1983), 258–259, 384; Gould, The Structure of Evolution-
ary Theory (Cambridge, MA: Harvard University Press, 2002), 104;
Gould, “Evolution and the Triumph of Homology, Or Why History
Matters,” American Scientist 74, no. 1 (1986): 60–69, esp. 63; Dou-
glas Futuyma, Science on Trial: The Case for Evolution (Sunderland,
MA: Sinauer Associates, 1995), 46–50, 121–131, 197–201, 205; Niles
Eldredge, The Triumph of Evolution . . . And the Failure of Cre-
ationism (New York: W. H. Freeman, 2000), 99–100, 144–146; Fran-
cisco Ayala, Darwin and Intelligent Design (Minneapolis: Fortress,
2006), 25–42, 85–89, esp. 34–36; Francisco Ayala, Darwin’s Gift to
Science and Religion (Washington, DC: Joseph Henry Press, 2007),
x-xi, 1–6, 22–23, 76, 88–92, 154–160; Jerry A. Coyne, Why Evolution
Is True (New York: Penguin, 2009), 12, 13, 18, 26–58, 64, 71–72, 81–
85, 96, 101, 108, 121, 148, 161; Richard Dawkins, The Blind Watch-
maker (New York: W. W. Norton, 1986), 93; Dawkins, River out
of Eden (New York: Basic Books, 1995), 95–133, esp. 105; Dawkins,
The Greatest Show on Earth: The Evidence for Evolution (New York:
Free Press, 2009), 270, 296–297, 315, 321–322, 332, 341, 351, 354, 356,
362, 364, 369, 371, 375, 388–389, 390–396 (we thank Colin Zwirko
and Caitlin Maples for their fine research on Coyne and Dawkins);
Nathan H. Lents, Human Errors (New York: Houghton Mifflin Har-
court, 2018); R. Diogo and J. Molnar, “Links between Evolution, De-
velopment, Human Anatomy, Pathology, and Medicine, with a Propo-
sition of a Re-Defined Anatomical Position and Notes on Constraints



60 Damned if You Do and Damned if You Don’t

arguments appear in major areas of biology, including ge-
netics, embryology, biogeography, paleontology, physiology,
genomics, and the like.

While we can only gesture toward this phenomenon here,
we briefly note that several studies have brought to light
notable features of these arguments.109 First, these studies
collectively show that the biologists who make these argu-
ments overwhelmingly view them as scientific—no doubt
because they draw on scientific data, inferences, patterns
of reasoning, and peer-reviewed research. Second, these
theological claims are typically indispensable to the argu-
ments in which they appear.110 Without God-talk, the ar-
guments in question do not support evolutionary theory.
Third, these arguments are often central to a given thinker’s
overall scientific case for evolution. Indeed, some of these
thinkers’ self-reported best arguments for evolution depend
upon God-talk.111 If we adopt any of the three objections
above, then this array of justifications for evolutionary the-
ory counts for little. But this is a high price: apparently,
textbooks must exclude some of the top biologists’ argu-
ments for evolution.112

This pressing question becomes even more difficult in light
of recent philosophical analysis of scientific testing. Among
philosophers of science, the current conventional view is

and Morphological ‘Imperfections,” ’ Journal of Experimental Zoology
326, no. 4 (2016): 1–10, elliptically; Patrick Forterre and Daniele
Gadelle, “Phylogenomics of DNA topoisomerases: their origin and
putative roles in the emergence of modern organisms,” Nucleic Acids
Research 37, no. 3 (2009): 679–692, esp. 679, elliptically; Ulrich
Kutschera, “Photosynthesis Research on Yellowtops: Macroevolution
In Progress,” Theory in Biosciences 125 (2007): 81–92, esp. 90–91;
Émile Zuckerkandl, “Intelligent Design and Biological Complexity,”
Gene 315 (2006): 2–18, esp. 10; George C. Williams, The Pony
Fish’s Glow (New York: Basic Books, 1997), 2, 4, 6–10, 104, 132–
160; John C. Avise, Inside the Human Genome: A Case for Non-
Intelligent Design (New York: Oxford University Press, 2010); Neil
Shubin, Your Inner Fish (New York: Pantheon, 2008), 173–198; Ian
Barbour, When Science Meets Religion (New York: HarperCollins,
2000), 111–114; Denis Alexander, Creation or Evolution, 234–251;
Francis Collins, Language of God (New York: The Free Press, 2006),
130, 134–137, 139, see also 176–177, 191, 193–194; Karl Giberson and
Francis Collins, The Language of Science and Faith (London: SPCK,
2011), 34, 38, 55, 101–108, 161; Kenneth Miller, Finding Darwin’s
God, 80, 100–103, 267–269.
109Dilley, “Nothing”; Dilley, “Charles Darwin’s use of theology”; Nel-

son, “Role of Theology”; Lustig, “Natural Atheology”; Hunter, “Dar-
win’s Principle”; Hunter, Science’s Blind Spot ; Hunter, “The Random
Design Argument.”
110See especially Nelson, “Role of Theology”; Dilley, “Nothing.”
111Among others, Coyne, Why Evolution Is True, 26–54, 79;

Dawkins, Greatest Show, 296–297, 315, 321–322. Gould, Structure,
104; Dobzhansky, “Nothing,” 126–128.
112It remains something of a puzzle just how biology textbooks can

accurately represent their field while also ignoring the key arguments
of some of their own notables. Aren’t such omissions somewhat con-
trary to the very purpose of textbooks in the first place? (Our thanks
to a reviewer for bringing this point to our attention.)

that scientific testing is contrastive.113 With rare excep-
tion, current models of testing require the juxtaposition of
one theory against one-or-another rival. This is true of the
Big 3: likelihood, inference to the best explanation, and
Bayesian models. Of course, it is possible for Darwinian
evolution to be tested against a non-theology-laden view
(say, neo-Lamarckian evolution). But the problem is that
any such test only shows (at most) that Darwinian evo-
lution is empirically superior to this other non-theological
theory. It does nothing to show that Darwinian evolution
is empirically superior to creationist rivals. Justifying this
latter claim requires head-to-head comparison.114 In such
a comparison, God-talk is unavoidable. Notably, the point
here isn’t just that a number of prominent biologists hap-
pen to invoke theology in their arguments for evolution;
rather, it’s that, according to recent analysis of scientific
testing, any textbook author who wishes to defend evolu-
tion against all rivals cannot avoid theology. In this sense,
if authors hold that Darwinian evolution is the best expla-
nation of things below, they must also contend with things
above.

4.5 Scientific Evidence Cast Aside

Yet perhaps the most striking problem with the ‘no theol-
ogy’ approach is that it undermines the very heart of bi-
ology textbooks: scientific evidence.115 If theology-laden
claims are excluded, then scientific evidence is unavailable
to critique creationism or to favor evolution over its su-
pernatural rivals. Regarding the first point, if science can-
not address religious matters, then scientific data and argu-
ments are impotent to falsify special creation, young-Earth
creationism, and the like. While some versions of creation-
ism are not empirically testable, other versions surely are.
Readers even vaguely familiar with the biology textbooks
on our list know that an overwhelming number claim (or
imply) that radiometric dating of ancient strata run counter
113See Sober, Evidence and Evolution, 109-88; Sober, Did Darwin

Write the Origin Backwards?, 121-54.
114Of course, some versions of creationism are not empirically

testable (such as versions that invoke a deceptive deity). Then again,
other versions of creationism are empirically testable—at least that’s
what many textbook authors seem to believe. Why else would they
critique creationism by reference to empirical data of, say, homologous
structures, vestigial organs, pseudogenes, atavisms, the nested hierar-
chy, biogeographical distributions, and the like? For discussion about
whether creationism, in its most defensible form, is really testable,
see Sober Evidence and Evolution, 109-88 and Did Darwin Write the
Origin Backwards?, 121-54. Replies to Sober include Lim, “A Cri-
tique of Elliott Sober’s Goals and Abilities Objection to the Design
Argument” and Dilley, “How to Lose a Battleship,” 621-23.
115cf. Larry Laudan, “Science at the Bar—Causes for Concern,”

Science, Technology & Human Values, vol. 7, no. 41 (Fall 1982):
16-19; Dilley, “How to Lose a Battleship,” 593-631.



Volume 1, Issue 2

5. A DIFFICULT DILEMMA 61

to young-Earth creationism, for example.116

Second, if theology is ‘absent,’ then textbooks’ scientific
data and arguments are also impotent to show the empirical
superiority of evolutionary theory over supernatural rivals.
But isn’t this a key reason why so many textbook authors
promote the former over the latter? Even a cursory read
shows that they widely believe anatomical similarities, fos-
sil sequences, suboptimal organs (and so on) count as em-
pirical grounds to favor evolution over creationism. The
evidence itself is supposed to have teeth.

Of course, a critic might counter that textbook authors
can still retain all the evidence for evolution (and against
creationism) without labeling this evidence as “scientific”
per se. Perhaps arguments that invoke theology ought to
be filed under a different heading, such as “philosophical
arguments” or “natural theology” or “cultural perspectives”
or similar. Textbooks can keep these arguments as long as
they are careful to alert students to the differences between,
say, scientific arguments and philosophical ones.

By way of reply: this objection attempts to solve the prob-
lem by superficial relabeling. Simply switching out titu-
lar headings (“philosophy” instead of “science”) hardly ad-
dresses the salient epistemological matter at hand. Does
empirical evidence have implications for the truth of evo-
lutionary theory vis-à-vis creationism? Do the data im-
pinge upon creationism at all? Mere labels change noth-
ing. Moreover, the arguments in question rely on scientific
data, methods, inferences, articles, and patterns of think-
ing. They bear all the hallmarks of scientific analysis. To
claim that they are not really scientific after all amounts to
hollow word play.

So, the point stands. The absence of theology is deeply
problematic. Moreover, this point transcends the analy-
ses we have given of particular theologies in this article
(presumptive theology, indeterminate theology, and so on).
That is, a critic can completely disagree with our analy-
ses of concrete cases of theology and yet still must face
this problem. Any scientific argument against creationism,
of whatever form, requires theology (for example, ‘If God
created human beings, we would expect. . . ’). And any sci-
entific argument that claims that the data favor evolution
over creationism also requires theology (for example, ‘On
evolution, we’d expect similar bone structures, but if God
was at work, we would not’). If theology is absent in the
case for evolution, then scientific evidence is unavailable to
critique creationism or to favor evolution over its supernat-
ural rivals. The empirical evidence becomes effete. If God
is gone, then so is the power of the data.
116See note 94.

*

We may now step back from our argument in Section 4. We
have contended that textbook authors must be prepared to
pay the price if they wish to exclude theological considera-
tions from their arguments for evolution. But this is not so
easy, especially in the light of the failure of halfway mea-
sures, the broader influence of American culture and the
Western intellectual tradition, the mind-world affinity be-
tween the cognitive hardwiring of human beings and the
striking appearance of design in nature, the theology-laden
elements of the Origin, a host of theology-laden arguments
for contemporary evolutionary theory by prominent biolo-
gists, the role of comparative evaluation in scientific testing,
and the centrality of empirical evidence. Collectively, these
factors encourage the inclusion, rather than exclusion, of
God-talk in biology textbooks.

5 A Difficult Dilemma

Let us pause once again to recount our overall argument to
this point. In Sections 2 and 3, we contended that the pres-
ence of theology in evidence-for-evolution sections raises a
whole range of problems for biology textbooks. In Section 4,
we argued the opposite. If our two arguments are correct,
then biology textbook authors face a crippling dilemma.
They are damned if they include God-talk and damned if
they don’t.

The difficulty of this dilemma can be further reinforced by
a brief examination of a common solution offered by text-
books.117 We argue below, however, that this solution is
both incoherent and self-serving. The failure of this ap-
proach underscores just how pressing the dilemma is.

In a nutshell, the pressing difficulty with the ‘common so-
lution’ is that some textbooks attempt both to incorporate
theology into their scientific arguments for evolution and,
at the same time, to bar theology from science itself. These
texts wish to have their cake and eat it too. Seventy-two
percent of textbooks on our list do so.118

The problem usually begins with a demarcational claim.
Although these textbooks are often not as precise as they
could be, in one way or another, a number of them ac-
117Just to be clear, in our view, it’s not entirely clear that textbook

authors are, in general, aware of this dilemma. So, we are careful
not to say that authors are self-consciously giving a “solution” per
se. Rather, we will examine a typical approach among the textbooks
on our list that, charitably interpreted, counts as a possible way to
handle the dilemma.
118See the “Separation/HM” column in Figure 1.



62 Damned if You Do and Damned if You Don’t

cept some version of the ‘separation’ thesis: science cannot
address religious matters, or religious claims are not appro-
priate within a scientific context.119 This thesis is some-
times articulated in the form of NOMA, complementarity,
or methodological naturalism. For example, in their text-
book Evolution, Carl Bergstrom and Lee Alan Dugatkin
write:

The strategy of trying to explain the world based
solely on natural phenomena is fundamental to
the scientific method and is at the heart of mod-
ern evolutionary biology. It is sometimes called
methodological naturalism. We call it natu-
ralism because of the focus on the natural rather
than the supernatural. We use the adjective
methodological because this strategy provides a
method or procedure for seeking scientific expla-
nations of the world. . . . If we propose an explana-
tion of a phenomenon based on natural processes,
that is, if we develop a hypothesis, we can then
test this hypothesis because we can observe and
often manipulate these processes. By contrast, we
have no way to observe, let alone manipulate, the
supernatural, and thus we cannot test supernatu-
ral explanations.120

Similarly, textbook authors Colleen Belk and Virginia Bor-
119For example, Freeman et al., Biological Science, p. 9; Urry et al.,

Campbell Biology, p. 16-26, esp. 18, 26; Singh-Cundy et al., Discover
Biology, p. 13, 402; Brooker et al., Biology, p. 460, elliptically; Belk
and Maier, Biology, p. 4; Solomon et al., Biology, p. 16. As noted,
a full list of textbooks that accept the separation thesis (or a halfway
measure) can be found in Figure 1. It’s worth pointing out that some
textbooks accept partial versions of the separation thesis. For exam-
ple, some claim that certain religious beliefs are testable by scientific
methods (and so fall within the purview of science) while other reli-
gious beliefs are not testable by scientific methods (and so are isolated
from science). For example, some textbooks state that scientists can
test whether God created life only 6,000 years ago, but cannot test
whether God exists per se. Yet these textbooks virtually never provide
any principled and defensible justification why “testability” applies to
some religious beliefs but not others. (The oft-cited appeal to the
necessity of “predictions” does not, in itself, resolve the matter; it
only repackages the problem with slightly more focus.) Moreover, in
principle it seems possible that some scientific data, now or in the
future, are relevant to the question of God’s existence. For example,
depending on one’s background beliefs, a version of the problem of evil
that turns on a scientific analysis of predation and animal suffering ar-
guably has implications for the implausibility of theistic belief. Or, on
the other side of the coin, the existence of a fine-tuned universe may
provide support for theistic belief to one degree or another—again,
depending on one’s background beliefs. Whatever the case, our own
speculation is that textbook authors who endorse a partial version of
the separation thesis either are unaware of the considerations explored
here or, perhaps, are trying to placate religious students by assuring
them that they are allowed a handful of generic religious beliefs (such
as “God exists”), which, they are told, remain safe from the power of
science. See also note 95.
120Bergstrom and Dugatkin, Evolution, p. 32, original emphases.

den Maier state:

For a hypothesis to be testable by science, we
must be able to evaluate it through observations
or measurements made within the material uni-
verse (Chapter 1). Because a supernatural creator
is not observable or measurable, there is no way
to determine the existence or predict the actions
of such an entity through the scientific method.
Therefore, as it is stated, special creation is not a
scientific hypothesis. In fact, any statement that
supposes a supernatural cause—including intelli-
gent design, which argues that while evolution is
possible, some specific features of organisms must
have been designed by a creator—cannot be con-
sidered science.121

As one texts simply puts it: “Scientists cannot evaluate
a claim about the actions of a supernatural agent, since
scientific theories explain phenomena that follow natural,
repeatable patterns.”122 In sum, in one way or another,
many of our textbooks endorse the separation thesis.123

Two concerns arise. First, if religious explanations can-
not be evaluated (or are ‘not testable’), then what of the
empirical tests in biology textbooks that aim to show the
superiority of evolutionary theory over special creation or
young-Earth creationism?124 The strong majority of text-
books we examined held that, across a wide range of sub-
disciplines of biology, creationist hypotheses in one form or
another have been vetted against the empirical data and
found wanting. Indeed, the whole point of comparative
arguments between evolutionary theory and creationism,
from the Origin to the present, is to show that the data
vindicate the former over the latter. Unfortunately, when
taken as a whole, over 70% of our textbooks offer an inco-
herent model of the relationship between science and reli-
gion: in the ‘nature of science’ chapters (typically), these
textbooks assert that religious claims cannot be evaluated
by the methods of science, for example, but in the ‘evidence
for evolution’ chapters, they draw on scientific evidence to
deem particular religious claims false.125 This is plainly in-
121Belk and Maier, Biology, p. 207.
122Zimmer and Emlen, Evolution, first edition, p. 320. Interestingly,

this quote was removed in the second edition of the text.
123In total, 21 out of 32.
124cf. Laudan, “Science at the Bar—Causes for Concern,” 16-19.
125See the “Incoherence” category in Figure 1. Examples include

Freeman et al., Biological Science, p. 9, 441-43; Urry et al., Campbell
Biology, p. 18, 26, 466-83, esp. 467-68, 477-78; Mader, Biology,
p. 11 (elliptically), 266-79, esp. 267; Singh-Cundy et al., Discover
Biology, p. 13, 386-89, 402; Phelan, What Is Life?, p. 4-5, 24, 332-33,
336-37; Audesirk et al., Biology, p. 10-11, 263-66, 270-71; Belk and
Maier, Biology, p. 4, 207, 213, see also 230; Bergstrom and Dugatkin,



Volume 1, Issue 2

6. FINAL THOUGHTS 63

coherent, like saying that a student failed an exam she was
never eligible to take.

A second concern surfaces as well. Even if we concede that
religious claims are not testable, we are still left with a prob-
lem: if the separation thesis is correct, why are theology-
laden arguments present in biology textbooks in the first
place? In particular, why are theological claims part of the
scientific case for evolution? As we have noted, theolog-
ical assertions appear in chapters (or sections) that self-
consciously present the scientific evidence for evolutionary
theory. In fact, theological claims play a key role in some
of these arguments. Yet if God-talk remains in a separate
realm from science-talk, then theological propositions have
no legitimate place in this context. Once again, in their
opening chapters, many textbook authors prohibit the in-
cursion of religious claims into science, then, in their ‘evi-
dence for evolution’ chapters, they permit religious claims
back into science for the purpose of bolstering evolution-
ary theory. Theological claims are barred—except when
they are not. This, too, is incoherent. Even worse, it is
self-serving. God-talk is only allowed when it strengthens
evolution. J.B.S. Haldane once quipped that “[t]eleology is
like a mistress to the biologist; he dare not be seen with
her in public but cannot live without her.” Perhaps some-
thing similar can be said of theology: her existence is never
officially acknowledged, yet her diverting benefits come in
handy when desired.

This underscores the difficulty that biology textbook au-
thors face. Do they include theology or do they dispense
with it? The ‘solution’ so common among textbooks on our
list only exacerbates the dilemma.

Evolution, p. 31-32, 53, 55, 115; Herron and Freeman, Evolutionary
Analysis, p. 38, 43, 56, 103; Hall and Hallgrimsson, Strickberger’s
Evolution, p. 56, 208, 574-75; Mader and Windelspecht, Essentials
of Biology, p. 11-12 (elliptically), 237-51, esp. 248; Taylor et al.,
Campbell Biology: Concepts and Connections, p. 6, 260-61, 264, 278.
Less clear, but still notable, examples include: Krogh, Biology, p. 8,
286-87, 293-95; Simon et al., Campbell Essential Biology, p. 4, 250;
Barton et al., Evolution, p. 75, 81-82; Sadava et al., Life, p. 15, 420,
443; Solomon et al., Biology, p. 16, 391-405, esp. 391-95; Shuster et
al., Biology for a Changing World, p. 2-6, esp. 3, 322-24, 352-69 (in
our view, the text lacks nuance about the testability of supernatural
hypotheses); Miller and Levine, Miller & Levine Biology, p. 5, 466
(see our discussion of Miller & Levine); Hoefnagels, Biology: Concepts
and Investigations, p. 13, 238-43, 260-79, esp. 264; Sadava et al.,
Life, p. 15, 420, 443; Zimmer and Emlen’s first edition of Evolution,
is incoherent on this score (see p. 42, 44, 318, 320). Their second
edition assiduously erases any mention of the supernatural in later
chapters, thus giving the appearance of avoiding the problem. But
see our comments about ‘halfway measures.’ On a related note, if one
is skeptical of Ridley’s own halfway measure, then Ridley, Evolution,
p. 43-70. See also Futuyma and Kirkpatrick, Evolution, p. 44-45,
573-83, esp. 578 on testing whether “an omnipotent God. . . created
anything.”

6 Final Thoughts

In this essay, we have argued that biology textbook authors
face an unwelcome predicament: there are pressing reasons
both to include and to exclude theological claims in argu-
ments for evolution. We attempted to establish this thesis
in four parts. In Section 2, we examined concrete examples
of straw god theology, presumptive theology, and indetermi-
nate theology. We argued that each type played an impor-
tant role in some arguments for evolution and yet all three
types face significant difficulties, including mischaracteriza-
tions of opponents, unsupported certitude about what God
would do, and trivial expressions about what God might
do.

In Section 3, we stepped back from concrete cases and in-
stead explored broader problems created by generally hav-
ing theology in biology textbooks’ arguments for evolution.
These problems include:

• The worry that direct engagement with contemporary
versions of creationism (or intelligent design) may give
students the mistaken impression that these hypothe-
ses are legitimate contenders to evolutionary theory.

• The practical lack of time and interest of authors to
learn and nuance various versions of creationism (and
ID), and to tease out in their textbooks which partic-
ular arguments support evolution over which versions
of creationism.

• In public high schools, the legal precedents in Epper-
son, McLean, Edwards, Kitzmiller, which may ban ar-
guments for evolution that draw on (or critique) certain
propositions involving a supernatural Creator.

• The epistemological problem that, given unguided evo-
lution, it likely inscrutable or improbable that hu-
man beings can legitimately justify certain theological
claims, including those used in arguments for evolu-
tion.

• The ‘science and religion’ demarcation problem, in
which the truth of either NOMA or complementar-
ity renders scientific evidence powerless to critique cre-
ationism.

• Similarly, the truth of either NOMA or complementar-
ity leaves scientific evidence impotent to favor evolu-
tion over creationism.

• The ‘methodological’ problem, in which, if method-
ological naturalism is proper to science, then theology-
laden arguments for evolution run counter to the sci-
entific method itself.



64 Damned if You Do and Damned if You Don’t

• Similarly, if methodological naturalism is canonical,
then, within the context of science, empirical evidence
cannot refute any theology-laden hypothesis or theory.

• And, finally, if methodological naturalism is correct,
then, within the context of science, empirical evidence
can never favor evolution over creationism.

Thus, the general presence of theology—of whatever kind—
creates unwelcome problems for biology textbooks. While
the saliency of these problems depends in part on the com-
mitments of a given textbook (or author), nonetheless, as
a collection, they pose a formidable obstacle.

In Section 4, we switched gears and tackled the question,
“Why not get rid of theology?” We argued that this is easier
said than done. Problems abound, including:

• The broader influence of the Western intellectual tradi-
tion and of American culture on the background beliefs
of millions of people in the United States

• The failure of halfway measures

• The ‘design-oriented’ cognitive hardwiring of human
beings

• The striking appearance of design in nature

• The mind-world affinity between this hardwiring and
the appearance of design in nature

• The loss of the central argument in the Origin

• The loss of a host of theology-laden arguments for con-
temporary evolutionary theory by prominent biologists

• The need for comparative evaluation in scientific test-
ing

• The loss of scientific evidence to critique creationism

• The loss of scientific evidence to favor evolutionary the-
ory over creationism

Collectively, these factors encourage the inclusion, rather
than exclusion, of God-talk.

Finally, in Section 5, we articulated the dilemma that is
now obvious. Moreover, we underscored the power of this
dilemma by examining a frequent ‘solution’ found in many
texts. We argue that this solution is thoroughly incoherent
and self-serving. The poor performance of textbooks on
this point shows just how deep the difficulty is. In the end,
the overall dilemma remains.

It would be a mistake, of course, to say that our analysis
constitutes a critique of evolutionary theory or of the com-
prehensive justification for it. Our argument is fully com-
patible with the truth and justification of evolution. While
we acknowledge that our worries about textbooks are not
entirely disconnected from these broader topics, even so our
study does not attempt an expansive analysis of the theory
itself or its general grounding.

We return at last to Thomas Kuhn’s meditation on text-
books in Structure. He contends that science textbooks
play a regulative ideal. They articulate to both laymen and
scientists the contours, boundaries, and content of a given
paradigm. They tell us what a field is, how it operates,
and the way scientists are supposed to reason within that
discipline. In this article, we have analyzed 32 textbooks,
including the top four in each of the key undergraduate cat-
egories: biology majors, non-majors, and evolution courses.
Surprisingly, the paradigm that emerges from these texts
includes a deep theological muddle. If our argument is
correct—and if Kuhn’s analysis of the role of textbooks is
right—then the problems we’ve described affect more than
just current undergraduates. Instead, as students graduate
and join the work force, they may well carry this conflicted
paradigm with them to broader domains of society, from
professional to lay, public to private. If so, then the prob-
lem will only deepen. Darwin once said in his later years
that he was in a theological muddle.126 On this point, as
with so many others, Darwin’s legacy will likely survive and
reproduce for some time to come.

Acknowledgements

The authors would like to thank Kathryn Applegate, Eliz-
abeth Barnes, Ashby Camp, Casey Luskin, Paul Nelson,
Adam Shapiro, Jim Stump, Jonathan Wells, and anony-
mous reviewers.

About the Authors

Stephen Dilley, Ph.D., is an associate professor of phi-
losophy at St. Edward’s University. He can be reach
at stephend@stedwards.edu. Nicholas Tafacory, MLA,
is an independent scholar. He can be reached at
nicholas.tafacory@gmail.com.

126Charles Darwin, letter to J.D. Hooker. 12 July 1870. Darwin
Correspondence Project, “Letter no. 7273,” accessed on 7 May 2019,
http://www.darwinproject.ac.uk/DCP-LETT-7273.



Volume 1, Issue 2

God-talk Table 65

Figure 1: God-talk Table

Notes: (a) An asterisk designates an elliptical statement that, in our view, can be plausibly interpreted as presumptive theology,
indeterminate theology, or the like (as appropriate) when considered in the larger context of the passage. (b) “Separation/HM”
indicates a version of the separation thesis (e.g., NOMA, methodological naturalism) or a halfway measure.

Title Straw God Presumptive Indeterminate Separation/HM Incoherence

Audesirk 11th p. 263 p. 265-66, 270-71 p. 10-11 p. 10-11, 263-66, 270-71
Barton 1st 75 75, 81 81-82* 75, 81-82
Belk 5th 205-207 4, 207 207, 213, 230*
Bergstrom 2nd 33 115 31-32 31-32, 53, 55, 115
Brooker 3rd 460 460*
Freeman 6th 435-38 442-43 9, 441-43
Futuyma 4th 9, 575-76 45 44-45 578 44-45, 573-83, esp. 578
Gunstream 12th

Hall 5th 572, 575 208* 561-62, 575* 56, 208*, 561-62, 574-75*
Herron 5th 38, 62, 66 56, 98 38, 43, 56, 103
Hillis 2nd 291*
Hoefnagels 4th 238 239-40 13*, 264 13*, 238-43, 260-79
Krogh 5th 285 293-95 8* 8 8, 286-87, 293-95
Mader 10th 266-67 277* 11* 11*, 266-79, esp. 267
Mader & W 4th 238 248* 11-12* 11-12*, 237-51, esp. 248
Mason 1st 9 9-11 442*
Miller 1st 5 5, 450-66, esp. 453-54
Morris 3rd 427* 393
Phelan 4th 300-304, 336-

37
332-33 24 4-5, 24, 332-33, 336-37

Raven 10th 11 9, 432-433* 428-29
Ridley 3rd 67, 263-64 281 43-70, esp. 44, 67-

68
44, 67-68, 263-64, 281

Russell 3rd 440 440
Sadava 11th 420*, 433* 15 15, 420*, 433*
Simon 2nd 152 161 4
Simon et al. 7th 244-48, esp.

245, 247
250 4, 6 4, 6, 245, 247, 250

Singh-Cundy 5th 386* 13, 402 13, 402, 386-89
Shuster 2nd 322-24 3 3, 322-24, 352-69
Solomon 11th 16 16, 391-405, esp. 391-95
Stearns 2nd

Taylor 9th 260-61 264* 6 6, 260-68
Urry 11th 467-68 477-78* 16-19, esp. 18; 26 18, 26, 466-83, esp. 467-

68, 477-78
Zimmer 2nd 29-34, 52 40



66 Damned if You Do and Damned if You Don’t

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