The periaqueductal grey is an ancient structure that is believed to play a role in our response to fear, pain, and altruistic behavior. Damage to this brainstem circuit causes delusions, and alien limb syndrome also intersected this circuit. This brain circuit, and the apparent importance of the periaqueductal grey, may have evolved to encourage altruistic behaviors and reduce the fear of living in an unpredictable world.
From the psychology today article, touchofgrey
If this part of the brain evolved for these reasons, altruism and safety, why did it have to point to God, and not man himself?