Evolutionary psychology of religion

The evolutionary psychology of religion is the study of religious belief using evolutionary psychology principles. It is one approach to the psychology of religion. As with all other organs and organ functions, the brain's functional structure have been argued to have a genetic basis, and are therefore subject to the effects of natural selection and evolution. Like other organs and tissues, this functional structure should be universally shared amongst humans and should solve important problems of survival and reproduction. Evolutionary psychologists seek to understand cognitive processes, religion in this case, by understanding the survival and reproductive functions they might serve.

There is general agreement among scientists that a propensity to engage in religious behavior evolved early in human history. However, there is disagreement on the exact mechanisms that drove the evolution of the religious mind. There are two schools of thought. One is that religion itself evolved due to natural selection and is an adaptation, in which case religion conferred some sort of evolutionary advantage. Alternatively, religious beliefs and behaviors may have emerged as by-products of other adaptive traits without initially being selected for because of their own benefits.

Religious behavior often involves significant costs including economic costs, celibacy, dangerous rituals, or by spending time that could be used otherwise. This would suggest that natural selection should act against religious behavior unless it or something else causing religious behavior to have significant advantages.

Richard Sosis and Candace Alcorta have reviewed several of the prominent theories for the adaptive value of religion. Many are "social solidarity theories", which view religion as having evolved to enhance cooperation and cohesion within groups. Group membership in turn provides benefits which can enhance an individual's chances for survival and reproduction. These benefits range from coordination advantages to the facilitation of costly behavior rules.

These social solidarity theories may help to explain the painful or dangerous nature of many religious rituals. Costly-signaling theory suggests that such rituals might serve as public and hard to fake signals that an individual's commitment to the group is sincere. Since there would be a considerable benefit in trying to cheat the system - taking advantage of group living benefits without taking on any possible costs - the ritual would not be something simple that can be taken lightly. Warfare is a good example of a cost of group living, and Richard Sosis, Howard C. Kress, and James S. Boster carried out a cross-cultural survey which demonstrated that men in societies which engage in war do submit to the costliest rituals.

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