Religions are not adaptations and they have no evolutionary functions as such. - Scott Atran

The more one accepts what is materially false to be really true, and the more one spends material resources in displays of such acceptance, the more others consider one's faith deep and one's commitment sincere.

Cultures and religions do not exist apart from the individual minds that constitute them and the environments that constrain them, any more than biological species and varieties exist independently of the individual organisms that compose them and the environments that conform them. They are not well-bounded systems or definite clusters of beliefs, practices, and artifacts, but more or less regular distributions of causally connected thoughts, behaviors, material products, and environmental objects. To naturalistically understand what "cultures" are is to describe and explain the material causes responsible for reliable differences in these distributions.

As with emotionally drawn-out religious initiations, neurobiological studies of stress disorders indicate that subjects become intensely absorbed by sensory displays. The mystical experiences of schizophrenics and temporal lobe epileptics, which may be at the extreme end of the "normal" distribution of religious experience, also exhibit intense sensory activity. These may help to inspire new religions. There is no evidence, however, that more "routine" religious experiences that commit the bulk of humanity to the supernatural have any characteristic pattern of brain activity.