See, it IS all in their heads
"Synopsis: Findings seem to point to a region of the brain commonly referred to as the 'God Spot' or 'God Module', that when stimulated creates hallucinations that are interpreted as mystical or spiritual experiences. This 'spot' is stimulated during meditation and prayer and is affected by electromagnetic fields and epilepsy. The resulting hallucinations may be the cause of mystical, spiritual and paranormal experiences as they can give feelings such as a presence in the room or an out of body experience. In the case of epileptics, this may be the reason for many of them becoming obsessed with religion. For those who experience the stimulation it is explained related to their own personal beliefs; a visit from an angel or lost loved one, an extraterrestrial encounter, a higher plane of consciousness or a visit from God."