One of the key things I took from the book "Shroom" by Andy Letcher is that in "olden" times people had no concept of taking mushrooms as a recreational activity. So an accidental eater of an hallucenogenic mushroom wouldn't think "Oh dear, I appear to be tripping my tits off", they would interpret the visual and auditory effects within the framework of their understanding of the world.
I've had some profound experiences on mushrooms, but while always being aware that I was on a "trip". If I had those experiences without that knowledge I would definitely believe in... something supernatural!
Going into the realms of wild speculation you can easily believe, once you've experienced it, that many bible passages were written after accidental ingestion of shrooms. Ezekiel's chariot... the whole of Revelations... :)