You could make an argument that the only individual (without a genetic predisposition to schizophrenia) who could stand to gain something from entheogens more than the dogmatic fundamentalist is the materialist atheist. I gained a lot of respect for Sam Harris recently for having the testicular fortitude to take the Pepsi challenge and doing what few of his ilk have – and perhaps, God willing, he will write a complimentary text for the other clergy.
“What is more material than a chemical? One could reasonably conclude from the action of psychedelics that the gods are nothing more than chemically induced figments of the hominid imagination. Yet, surprisingly, most of the people who have had these experiences don’t see the matter that way at all. Even the most secular among them come away from their journeys convinced there exists something that transcends a material understanding of reality: some sort of a “Beyond.”
It’s not that they deny a naturalistic basis for this revelation; they just interpret it differently. If the experience of transcendence is mediated by molecules that flow through both our brains and the natural world of plants and fungi, then perhaps nature is not as mute as Science has told us, and “Spirit,” however defined, exists out there is immanent in nature, in other words, just as countless premodern cultures have believed. What to my (spiritually impoverished) mind seemed to constitute a good case for the disenchantment of the world become in the minds of the more psychedelically experienced irrefutable proof of its fundamental enchantment.
… So here was a curious paradox. The same phenomenon that pointed to a materialist explanation for spiritual and religious belief gave people an experience so powerful it convinced them of the existence of a nonmaterial reality — the very basis of religious belief.”