Have you ever taken LSD? It's an experience that cannot be described to someone who has not; there is no frame of reference. Trying to describe an LSD trip is like trying to describe what the color red looks like to a man blind since birth. It's called a hallucinogen but you don't really hallucinate, rather you misinterpret your senses, which completely overload your brain. A normal brain filters the senses, LSD removes its ability to do that. When you come down you can't really remember exactly what it was like; your brain is not the same.
Yes. Many times. I even spent a year and a half incarcerated in my teens for my LSD adventures. You need to keep in mind that your description is your take on your experience. You didn't have my experience, or anyone else's for that matter. No consensuality. No repeatability. I might have seen flaming leaves; you might have smelled polka dots. I might have found the experience discomfiting; you might have found it revelatory. Or infinite variations of a similar disjoint nature.
Of course not, unless they believe that the experience is real.
I think you're selling the theater of the mind quite short. Again, your experience is not my experience. A well written book will can transport me (and let me admit here that I own a literary agency, and am the son of one of the golden age SF writers, a hugo, and other, award winner... I know at least a little bit about well written books.) For that matter, you're selling theater short. Take a horror movie. Why do people scream when watching them? It's just a movie, and underneath that, it's a complete fiction, and they absolutely know that going in. Yet they scream. What's that about, other than accepting the experience as what's actually happening? I mean, either that, or they're faking like a bunch of fools pretending to speak in tongues. Which -- quite frankly -- I don't buy. Screams and other reactions are too common and too well aligned with what's going on on-screen or on-stage to be that kind of fakery.
I can't agree with your diagram at all
That's fine. You're entitled to your own opinion; you just aren't entitled to mine. Looking at the rest of what you said there, particularly your idea of how many scientists are religious... I'm also compelled to remind you that the real world disagrees with your perception. You might want to look into that.