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So what are the cognitive adaptations of which religion is hypothesized to be a by-product? The first is our hyperactive agency detection device, which leads us to infer that unseen forces are human agents (Thompson & Aukofer, 2011). This likely evolved as a protection or precaution adaptation (Boyer, 1992). We mistake a shadow for a burglar but never mistake a burglar for a shadow—an error management mechanism that helps us to avoid costly errors such as being robbed or mugged. This adaptation leads to misapplied anthropomorphism, as when we say “the sun is trying to come out” or “the clouds look angry.” Clouds and skies, of course, don’t have agency, yet we attribute human-like motivations to them as if they were agents with motives and intentions. Again, it is a small step to infer a god with human-like agency—a god that wants us to pray to him, worship him, sacrifice for him, and will punish us if we disobey him. Even children have what is called “promiscuous teleology,” the tendency to attribute purposes to people, groups, societies, cultures, mother earth, the universe, and god. A second class of cognitive mechanisms consists of theory of mind adaptations, by which we infer unseen beliefs, desires, and intentions in other people. Theory of mind adaptations are extremely useful in predicting the behavior of other people, their proper function. It is a small extrapolation to go from “there are people watching me who have a desire for my well-being” to “there is an all-seeing god watching me who has a desire for my well-being.” That is, we imbue these agents with motives, goals, and desires. Next comes the attachment system, which originally evolved in the context of mother–child bonds for protection and nurturance (Kirkpatrick, 2005). A 2-year-old reaching out to a mother to be soothed bears resemblance to a worshiper reaching out to a god: “we never lose the longing for a caretaker… [and] a god is always there for us” (Thompson & Aukofer, 2011, p. 45). Adaptations to form attachments, in short, get transferred to supernatural agents. Reciprocity adaptations are also activated, as when we make sacrifices for gods or make covenants with gods and expect that the gods will provide us with benefits in return.
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David M. Buss (Evolutionary Psychology: The New Science of the Mind)