[0] https://en.wikipedia.org/wiki/Burning_bush#Biblical_entheoge... also https://www.rickstrassman.com/publications/dmt-and-the-soul-...
For people that have had psychedelic experiences, the link between religion/spirituality and these experiences, as well as the practices that produce them, is undeniable.
Here are some additional links besides the ones provided in sibling comments:
https://psychedelictimes.com/amanita-muscaria-and-psilocybin...
https://www.amazon.com/gp/product/1620555026/ref=as_li_tl?ie...
https://upload.wikimedia.org/wikipedia/commons/0/03/Pschoact...
So the psilocybin mushroom part of your theory strikes me as very unlikely.
Religion basically goes.
1. Take drugs and related stuff for fun or whatever
2. See something impressive
3. Cultivate your ability to use the drugs or whatever to investigate the impressive thing more closely.
4. Said cultivators impress the locals.
5. Locals document the whole thing.
6. Cultivators fall out of fashion, come into conflict with the local ruling class or for whatever reason disappear from public view.
7. But the documentation remains. Forming the seed of a new document-based culture.
8. Rulers of said culture forbid drugs and similar explorations. The scholars become a theological ruling class.
Techniques : Psychedelics. Meditation. Breathing techniques. Controlled stress and pain. Fasting. Sleep deprivation. Theater. Sex.
Off the top of my head. A google might reveal more.
It really inhibits our whole process of communication.
I am actually elevating religion above the usual scienceist-attitude that is so common these days.
Try to keep an open mind.
Perhaps @swayvil could have worded their comment better, and perhaps this simply isn’t the correct forum.