"Psychedelics and Religious visions"; sorry for the typo.
Burning bushes that speak, fiery chariots, angels and a great deal of the book of 'Revelations' could all easily fit into the description of 'hallucinations'. The interesting thing about these altered states is that they are just as real as 'unaltered', after all. There is nothing to say that what was 'seen' was not true. Perhaps only to and for that 'seer', but true nonetheless.
I think this could also account for many other world views of religions, not just Biblical ones. The Egyptian pantheon is filled with fantastic creature/humans that could have come from the psyche of a holy person/shaman in religious ecstasy.
Many of the precepts that settled into cultures around the world could easily have had their source in such experiences, and become laws.