I think there's an awful lot of wishful thinking going on here. There's going to be a fundamental difference between your experience of tripping in the 21st century and some guy 2000 years ago. You're educated, you know it won't do you any harm, so you can sit there pontificating "Ah yes, this feels quite mystical, reminds me of that account in a book I read about God"
Try looking at it from the perspective of some uneducated guy 2000 years ago. He has no idea what the trip means, he has fuck-all understanding of ideas of the brain or how it works, probably lives in a hut and digs holes to shit in. The idea that he's going to be able to connect tripping with intellectual ideas about God is pretty fucking far-fetched isn't it. My guess is he'd run around a bit, run to someone elses hut for help and they'd try and beat the demon out of him. Even in the 21st century people have bad trips - can you imagine how high the bad trip rate would be back then?
It's also wishful thinking to presume that the modern epistemology is the only one that is valid that has ever existed. What does a person being "educated" in the modern sense have anything to do with them deriving spiritual or philosophical value from a trip? What does them living in a hut and shitting into a hole have to do with being spiritual? Are you judging them for not having our modernisms?
How do you even
know what some person's idea of a trip was 2000 years ago, and why does the fact that it happened 2000 years ago mean the account is somehow less trustworthy?
Yes, I'm sure bad trips have happened all over the world and throughout all time - does that mean good trips were impossible? Did they even think of them as "trips"? There are cultures who use entheogens who don't even see them as substances, but as Beings that enter them and grant them specific teachings. The way people view entheogens around the world is just as diverse as the number of creation stories that exist.
If you want to read more about plant spirit medicine and how humanity has always used this mode of communication of medicine and knowledge
I'm not sure humanity has always used tripping as a way of life. It's mostly concentrated in a few isolated spots in South America. And even then it wasn't as if people just went round and tripped for fun or to "meet God". There was usually one guy who tripped for the tribe and it was almost exclusively for "medical purposes". If your kid was dying and nothing else worked you went to the bloke who tripped to see if he could find any help for you. Like the africans went to a witchdoctor. The placebo effect in these cases was the key - even now if an african witchdoctor tells someone they are going to die the people are so gullible they often rapidly die just from placebo.
A lot of the "evidence" that Mckenna suggests for tripping in Africa has been shown to be bullshit - that drawing of "the mushroom man" with mushrooms coming out of his body for example. It turns out that drawing used in the book is a "representation" of the real drawing that was done by Mckennas wife. When you look at the real drawing it doesn't look anything like a fucking mushroom man.
I do accept that it's possible to read psychedelic use into religions - you read the book of revelations "A serpent appeared from the sea and a diamond dropped out of it's arsehole" - "Like wow, he must be tripping!!". But you can read it into anything - voodoo, the moonies. Even that fucking idiot who created Scientology - "Aliens from another planet? Telling mankind how to live? He must...have BEEN TRIPPING ON DMT!!!".
Nah, it's bullshit.
First of all... when I talked about plant spirit medicine, I was not referring to psychedelics, but those are included too. If you read the anthropological research about herbal medicine in indigenous cultures, the stories are very fascinating. Whenever modern scientific researchers go to indigenous regions (like the Amazon) to discover new medicines, they often turn to locals. The trial and error theory is always applied by modern science in terms of how these people discovered the medicines they use, but when asked how the discovered the medicine, the answer is universally the same around the world: they talked to the plants.
How is it that in the Amazon rainforest, where there are millions of plants and billions of potential plant combinations, Ayahuasceruos figured out that ayahuasca + datura = a deep, entheogenic and spiritual experience? Beyond psychedelics, how were medicines discovered in the first place? Do people seriously believe that villages of limited resource would send their own people into the woods to randomly sample plants, and maybe dying, to figure out what does what? Impossible, especially in a place like the Amazon.
Clearly humans have always had some connection to plants that we have lost touch with in the modern. I am not claiming that I know how it works and I'm not saying all this to try and validate my modern entheogen use like McKenna is. What I'm saying is that this goes way, way beyond just tripping. These are entire epistemologies unto themselves and writing them off as pre-modern and primitive is INCREDIBLY short sighted.
I highly recommend those two books I mentioned earlier, especially the first one by Buhner. He offers plenty of scientific research that you can verify that will shed light on this for you. He's not so agenda based like McKenna.