Your point about writing things down reminds me of Bloom's interpretation of Hamlet, "self-overhearing", where his monologues can be read as each sentence directly influencing the next through Hamlet hearing himself and 'responding' (he explains it a bit better than that haha).

The only non-chemical induced religious experience I can think of is remarkably boring: I was reading the Quran for the hell of it, went outside for a smoke and laid down on the deck. The sun hit me, then the normal tactile sensation of warmth progressed into... inner warmth? Eyes were closed, but somehow I felt like i shot to sun, then turned around, kinda had a "oh" moment then came back down. Washed over with feelings of warmth and contentment. Only lasted a couple minutes, nothing similar before or after.

I'm not a religious person, and I hadn't just read anything that deeply resonated with me or anything, but it still kind of freaks me out