The Belief in God: Why People Believe and Why They Don’t

Abstract

Belief in a god or gods is a central feature in the lives of billions, and a topic of perennial interest within psychology. However, research over the last half decade has achieved a new level of understanding regarding both the ultimate and proximate causes of belief in God. Ultimate causes—the evolutionary influences on a trait —shed light on the adaptive value of belief in God and the reasons why a tendency towards this belief exist in humans. Proximate causes - the immediate influences on the expression of a trait – explain variation and changes in belief. We review this research, and discuss remaining barriers to a fuller understanding of belief in God.

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https://doi.org/10.1177/0963721418754491
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At one point in the prehistory of our species, no one
believed in a god. Today, an estimated 80% of humans
are theists (P. Zuckerman, 2007). Why did the belief in
gods become so broadly and powerfully held? Religion
has fascinated psychologists since James (1902), but a
recent body of research has sharply focused on the
reasons people believe in gods—defined here as
“supernatural beings believed to have created or [to]
govern all reality, intervene in human affairs, and
enforce or support human morality” (Botero etal., 2014,
p. 16784). Here, we separate these reasons along Mayr’s
(1961) ultimate versus proximate categorization of
causal explanations. Ultimate explanations focus on
why a behavior evolved—its functional origins as an
adaptation or evolutionary by-product. Proximate expla-
nations focus on the immediate factors influencing how
and when a behavior is performed. For example, the
proximate explanation for a bird undertaking its yearly
migration is the experience of changing daily hours of
sunlight, but the ultimate explanation is that because
of the scarce winter food supply, better survival and
reproductive opportunities were afforded to those who
migrated to warmer climates.
Ultimate and proximate causes thus provide comple-
mentary—rather than competing—explanations for a
behavior. Although not without critics (see Vromen, 2017,
for a discussion), the ultimate-proximate distinction has
proved useful for preventing confusion about different
types of causation (Scott-Phillips, Dickins, & West, 2011).
For example, a question posed at one level of explanation
cannot be answered at another level of explanation. An
ultimate question about why cooperation exists requires
an explanation for the evolution of cooperation, such as
that it provides a selective advantage by increasing the
fitness of one’s kin. It cannot be answered with a proxi-
mate explanation for cooperation, such as concerns for
praise and blame (Scott-Phillips etal., 2011). This ultimate-
proximate distinction thus provides a useful organizing
framework for recent research on the belief in God.
Ultimate Reasons for the Cognitive
Features Making Belief in God Intuitive
Features of the human mind have arisen as evolved
adaptations to environmental challenges throughout our
prehistory. However, many authors have argued that
these cognitive adaptations have, as a by-product, made
humans prone to the conception of supernatural agents
(Norenzayan etal., 2016). An early, oft-cited example
of such a cognitive adaptation is our hypersensitivity to
754491CDPXXX10.1177/0963721418754491Mercier et al.Belief in God
research-article2018
Corresponding Author:
Azim F. Shariff, University of California, Irvine, Department of
Psychology and Social Behavior, 4558 Social and Behavioral Sciences
Gateway, Irvine, CA 92697
E-mail: azim.shariff@uci.edu
Belief in God: Why People Believe,
and Why They Don’t
Brett Mercier1, Stephanie R. Kramer2, and Azim F. Shariff1
1Department of Psychology and Social Behavior, University of California, Irvine, and 2Department of Psychology,
University of Oregon
Abstract
Belief in a god or gods is a central feature in the lives of billions of people and a topic of perennial interest within
psychology. However, research over the past half decade has achieved a new level of understanding regarding both
the ultimate and proximate causes of belief in God. Ultimate causes—the evolutionary influences on a trait—shed light
on the adaptive value of belief in God and the reasons why a tendency toward this belief exists in humans. Proximate
causes—the immediate influences on the expression of a trait—explain variation and changes in belief. We review this
research and discuss remaining barriers to a fuller understanding of belief in God.
Keywords
belief, God, evolution, religion

2 Mercier et al.
cues of humanlike agency (Guthrie, 1993). Because failing
to notice potentially dangerous agents in our ancestral envi-
ronment was costlier than making false alarms, our agency-
detection system evolved to be tilted toward overperception.
But the by-product of being adaptively tuned to overper-
ceive agency is that humans are biased toward perceiving
agents—such as gods—behind natural phenomena.
Alongside this hypersensitive agency-detection
device, theorists have described biases for overperceiv-
ing human-relevant purposes behind events and
objects—adaptive because of the necessity of decipher-
ing intentionality and the usefulness of understanding
tools but leading in turn to a tendency to make attribu-
tions of divine purpose (Kelemen, 2004). In addition,
because of the importance of understanding mental
states, humans evolved separate systems for thinking
about social stimuli and physical, nonsocial objects
(Bloom, 2007). Although this was adaptive for our
social cognition, a by-product was that it made it easy
for humans to imagine the existence of disembodied
supernatural agents that nonetheless had an active
mental existence (Forstmann & Burgmer, 2015).
These by-products of innately occurring cognitive
features provided the psychological raw materials from
which supernatural beliefs were culturally shaped into
shared God beliefs (Gervais, Willard, Norenzayan, &
Henrich, 2011). Unlike the gods of most modern reli-
gions, the supernatural agents that early societies
believed in tended to be nonmoralistic, with limited
powers and knowledge (Roes & Raymond, 2003). To
explain the transition, cultural evolutionary theorists
have argued that, in a process roughly analogous to
genetic evolution, selective pressures made certain cul-
tural beliefs more likely to survive and spread than
others. As human group sizes increased, it became dif-
ficult to track which members were cooperative con-
tributors and which were defecting free riders, straining
the mechanisms maintaining group cohesion. Beliefs
in omniscient supernatural watchers capable of doling
out punishments and rewards helped solve this problem
by deterring free riding, giving groups adopting these
beliefs an advantage over other groups (Norenzayan
etal., 2016; though see the commentaries to that article
for criticisms and alternative perspectives). In a recent
cross-cultural study demonstrating this religiously
inspired prosociality, researchers found that the more
individuals believed their gods were punitive and
knowledgeable about humans, the more money these
individuals shared with anonymous coreligionists in an
economic game (Purzycki etal., 2016). In another study,
subtle reminders of God made people more charitable,
but only when these reminders were of God’s punitive
aspects (Yilmaz & Bahçekapili, 2016).
Thus, increased cooperation made groups who
believed in watchful, moralizing gods more likely to
survive and spread their beliefs, making these beliefs
more common. Analysis of historical societies has found
that these beliefs were especially likely to spread where
the need for cooperation was high, such as in societies
with rights to movable property, high political complex-
ity, or resource scarcity (Botero etal., 2014).
Proximate Reasons for Who Believes
and When
While ultimate explanations tell us why specific cogni-
tive biases evolved, proximate explanations show how
and when these biases contribute to belief in God.
Understanding these cognitive, motivational, and
social factors that influence belief helps explain the
great variation in religiosity among our species—not
just across countries (84% of people in the Philippines
report being certain about God’s existence, compared
with 4% in Japan; Smith, 2012) but across time—which
can in turn inform long-standing debates about
secularization.
Cognitive factors
One method of examining the proximate cognitive fac-
tors influencing belief in God is to compare individuals
who differ on cognitive factors, such as the tendency
to rely on evolved cognitive intuitions. People with an
analytical thinking style—that is, people more likely to
override their intuitions in decision making—are less
likely to be believers (Pennycook, Ross, Koehler, &
Fugelsang, 2016). In addition to overriding intuitions,
the extent to which people experience these intu-
itions in the first place also plays a role. Because
attributing mental states to unseen agents facilitates
belief in God, people who less easily perceive and
understand the mental states of others (such as indi-
viduals on the autism spectrum and men relative to
women) show lower levels of belief (Norenzayan,
Gervais, & Trzesniewski, 2012).
Though still controversial, convergent research sug-
gests that more intelligent individuals are less likely to
believe in God (Kanazawa, 2010; Lynn, Harvey, & Nyborg,
2009). Although partially explained by its overlap with
analytic thinking, the relationship between belief in God
and intelligence also has compelling motivation-based
explanations. For example, M. Zuckerman, Silberman,
and Hall (2013) argue that more intelligent individuals
may have less need for the psychological benefits that
religion provides (such as a sense that the world is
controllable; see below) because they can more ably
generate these benefits themselves. Intelligent people
are also more likely to be nonconformists and thus feel
more comfortable deviating from the (typically) reli-
gious majority.

Belief in God 3
Motivational reasons
In addition to studying the factors that make people
more or less cognitively receptive to belief in God,
research has also examined the factors that motivate
(or demotivate) people to believe. For instance,
Sedikides and Gebauer (2010) present a meta-analysis
showing that high self-enhancers—people with a strong
desire to see themselves positively—have higher levels
of intrinsic religiosity, especially in societies that place
greater value on religion. They argue that elements of
religion—such as a believed association with God—
create feelings of positive self-regard, motivating high
self-enhancers to adopt stronger religious beliefs. How-
ever, more research is needed to confirm this causal
direction.
Other research has used experiments to provide a
causal test of motivational factors influencing belief.
Epley and colleagues show not only that chronically
lonely people are less likely to believe in God but also
that randomly assigning people to situations that
increase loneliness (such as informing people that they
will probably be alone later in life) increases reports
of belief (Epley, Akalis, Waytz, & Cacioppo, 2008).
Compensatory-control theory posits that people
strive to believe their world is predictable and control-
lable (Kay, Gaucher, Napier, Callan, & Laurin, 2008).
On the basis of this theory, Kay and colleagues (2008)
argue that belief in God is motivated by a need for
perceived control, which they demonstrated by showing
that experimentally threatening people’s sense of con-
trol can increase belief in God. Experimentally increas-
ing mortality salience has also been shown to increase
belief (Vail, Arndt, & Abdollahi, 2012), which may
explain why religiosity tends to increase when people
get older, become terminally ill, or experience a natural
disaster (Bentzen, 2013; Jong, 2013). The ability of the
belief in God—and religion more generally—to palliate
the effect of negative life events has been offered as
one explanation for religiosity’s association with greater
well-being (Whitehead & Bergeman, 2011).
Together, these cognitive and motivational factors
help explain where and when belief in God has
declined around the world. For example, some research-
ers have argued that the declines in belief over the 20th
century can be explained by the corresponding
increases in IQ over this same period (Lynn etal.,
2009). Likewise, religiosity has tended to decline when
strong and predictable political systems dampen the
uncertainty and adversity in a society. The religiosity
of the United States, which is aberrantly high among
rich countries, has been attributed to the sense of eco-
nomic insecurity caused by its (relatively) laissez faire
economic policies (Norris & Inglehart, 2004).
Social factors
Finally—but critically—declines in belief are acceler-
ated by feedback loops with changing cultural norms.
In religious societies, people are socialized to believe
in God through communities that value and encourage
belief (Sherkat, 2003). This socialization, particularly
the religious behaviors of one’s community, appears to
be one of the strongest determinants of belief. Accord-
ing to Henrich (2009), humans evolved to be acutely
sensitive to credibility-enhancing displays in their ten-
dency to adopt beliefs. For example, claims that blue
mushrooms are not poisonous are more credible when
the claimant eats the mushrooms (Henrich, 2009). Con-
sistent with this theory, research has shown that the
more frequently children observe others not just pro-
fessing belief in God but engaging in religious credibility-
enhancing displays (such as volunteering for religious
organizations), the more likely these children are to
believe in God as adults (Lanman & Buhrmester, 2017).
Thus, once triggered, generational declines in belief in
God might gain momentum through a positive feedback
effect. Children of each generation are raised witness-
ing fewer displays of religious commitment than the
last, making them less likely to believe in God and less
likely to expose their own children to displays of com-
mitment (Willard & Cingl, 2017; see Fig. 1).
Limitations With the Literature
Though the past 5 years have seen remarkable progress
in the psychology underlying belief in God, a more
complete understanding of the phenomenon has been
hampered by significant limitations in interpreting what
is by far the primary source of data about beliefs in
God: self-reports.
The first issue derives from a Western and Abrahamic
bias in the psychology of religion. Efforts to conduct
research outside the monotheistic, Judeo-Christian reli-
gious traditions in North America and Europe are limited
not just by inconvenience and political restrictions (e.g.,
in China and several Muslim-majority countries) but also
by conceptual differences in the meaning of belief. That
is, methods of measuring belief in God that assume a
traditional Western conception of God may not be
appropriate for understanding the beliefs of people with
different conceptions of God (Höllinger & Eder, 2016).
These cultural variations in the meaning of belief are
rarely assessed (for a notable exception, see Bluemke,
Jong, Grevenstein, Mikloušic´, & Halberstadt, 2016). How
similar is an American Christian’s belief in a personal
God to the Vedic theistic beliefs in India or to ancestor
worship in China? Although someone from each country
may answer affirmatively to straightforward questions

4
Evolved Cognitive Biases
Cultural Evolution
Hypersensitive agency detection: Over-
perception of agency leads to the perception
that God is causing natural events.
Promiscuous teleology: Overperception of
purpose leads to attributions of divine purpose
in the world.
Mind–body dualism: Perceiving minds as
separate from bodies makes it easy to
conceive of disembodied supernatural
agents.
Belief in punitive, monitoring gods provided
a survival advantage by increasing in-group
cooperation, making these beliefs more
common.
These beliefs were most likely to spread
when cooperation was important, such as in
societies with few resources, rights to
movable property, and high political
complexity.
Belief
in
God
Social
Motivational
Cognitive
Socialization (+): People are more likely to believe in
God when this belief is valued and encouraged by their
community.
Credibility-enhancing displays (+): Witnessing credible
displays of religious commitment increases the likelihood
of believing in God.
Loneliness (+): When lonely, people are more likely to
perceive agents, including God.
Mortality salience (+): Belief increases when death is salient.
Self-enhancement (+): In places where religion is
valued, a desire to see oneself positively motivates belief
in God.
Control (–): Belief in a controlling God increases in
uncontrollable situations, allowing people to regain a
sense of control.
Analytical thinking style (–): Analytical thinkers are less
likely to be influenced by the cognitive intuitions
contributing to belief in God.
Mentalizing (+): People more capable of mind reading
are more likely to perceive the existence of God.
Intelligence (–): People with higher intelligence are
less likely to believe in God.
Proximate Factors
Ultimate Factors
Fig. 1. An overview of ultimate and proximate factors contributing to belief in God. On the right-hand side of the figure, a plus sign denotes that the factor increases the likeli-
hood of belief, whereas a minus sign denotes that the factor decreases the likelihood of belief.

Belief in God 5
about belief in “God” (if only to conform to Western
surveyors’ expectations), it remains unclear whether
these homogenous responses disguise psychologically
important differences.
Even in Western contexts, the continued evolution
of religion has led to widening conceptions of God,
which may not cleanly correspond to traditional beliefs.
For example, 30% of Europeans, including many self-
described “atheists,” report believing in a “spirit God or
vital life force” (Bréchon, 2007, p. 469). Should this
quasideism be defined as belief in God? Clearly, tradi-
tional methods are not fully capturing the scope and
meaning of belief in these contexts.
The other major challenge to the integrity of self-
report-based research on belief in God is that reports
may reflect self-presentation concerns as much as genu-
ine belief. Around the world, people show considerable
prejudice against nonbelievers (Gervais etal., 2017),
and majorities consider belief necessary for morality
(Pew Research Center, 2014). Thus, people may be
inclined to present themselves as more religious than
they truly are. Evidence of exaggeration in church
attendance supports this concern—as evidenced by
discrepancies between direct self-reports and head
counts (Hadaway, Marler, & Chaves, 1993) or time-use
diaries (Brenner, 2011). And though it is harder to con-
firm the veracity of people’s internal beliefs than their
behavior, research supports the idea that people are
indeed overreporting their belief in God. Survey tech-
niques that decrease socially desirable responding, such
as responding anonymously online rather than directly
to a live surveyor (Cox, Jones, & Navarro-Rivera, 2014)
or using the unmatched-count technique (Gervais &
Najle, 2018), suggest that rates of belief may be sub-
stantially lower than traditional methods have assumed.
The potential invalidity of self-reported belief calls
into question the interpretation of many findings within
the social scientific literature on religion. Consider
research that finds relationships between God beliefs
and any construct that might be misreported because
of social pressure (e.g., happiness, health, prosociality).
Any correlation between belief in God and (for exam-
ple) happiness may be the result not of a genuine
relationship between the two but of a third variable:
individual differences in people’s tendency to overre-
port levels of both. Furthermore, experimental studies—
including those discussed above—that show changes
in self-reported belief in God could very well be reveal-
ing changes in people’s willingness to admit their belief
rather than changes in belief itself.
These methodological questions should weigh heav-
ily on the field. The past 5 years have seen an expanding
body of research on belief in God; researchers should
devote some of the next 5 to tackling these critical chal-
lenges. Until we do, we will not fully understand the
extent, nature, or future of how belief in God factors
into our psychology and society.
Recommended Reading
Norenzayan, A., Shariff, A. F., Gervais, W. M., Willard, A. K.,
McNamara, R. A., Slingerland, E., & Henrich, J. (2016).
(See References). An in-depth review of the cultural evo-
lution of religion plus an assortment of commentaries that
discuss additional and alternative perspectives.
Norris, P., & Inglehart, R. (2004). (See References). A review
of the causes and consequences of secularization around
the world.
Sedikides, C. (2010). Why does religiosity persist? Personality
and Social Psychology Review, 14, 3–6. The introduction
to the 2010 Personality and Social Psychology Review spe-
cial issue on religion, which provides a summary and
overview of the approaches contained within the issue.
Zuckerman, M., Silberman, J., & Hall, J. A. (2013). (See
References). A meta-analysis, comprehensive review,
and theoretical discussion of the research examining the
relationship between intelligence and religiosity.
Action Editor
Randall W. Engle served as action editor for this article.
Declaration of Conflicting Interests
The author(s) declared that there were no conflicts of interest
with respect to the authorship or the publication of this
article.
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