The philosopher Daniel Dennett writes in his The Evolution of Misbelief:
“Other approaches notwithstanding, the currently dominant evolutionary perspective on religion remains a by-product perspective. On this view, supernatural misbeliefs are side effects of a suite of cognitive mechanisms adapted for other purposes. Such mechanisms render us hyperactive agency detectors, promiscuous teleologists, and intuitive dualists; collectively and incidentally, they predispose us to develop religious beliefs-- or at least they facilitate the acquisition of such beliefs.”
Recent scientific theory suggests that beliefs are-a residual by-product of an evolutionarily useful instinctive process (see Satoshi Kanazawa, an evolutionary psychologist at the London School of Economics).
Called the Savanna-IQ Interaction Hypothesis, Kanazawa's theory attempts to explain the differences in the behavior and attitudes of intelligent and less intelligent people, The hypothesis is based on two assumptions:
"First, we are psychologically adapted to solve recurrent problems faced by our hunter-gatherer ancestors in the African savanna."
"Second, that 'general intelligence' (what is measured by IQ tests) evolved to help us deal with nonrecurrent problems for which we had no evolved psychological adaptations."
The assumptions imply that "intelligent people should be better than unintelligent people at dealing with 'evolutionary novelty' — situations and entities that did not exist in the ancestral environment suggesting that evolutionary intelligence is something that opposes primitive instincts.
Thus, according to Edward Dutton, a research fellow at the Ulster Institute for Social Research in the United Kingdom.
"Religion is nothing more than a primitive instinct, whereas true Intelligence means rationally solving problems as a means to overcome religious instinct. Overcoming religious instinct means being intellectually curious and open to non-instinctive possibilities.”