We've already addressed this. There's nothing conveniently online for me to cite, so you'll all have to settle for the book recommendation. As for explaining it myself, I'm no neurologist, and I don't trust myself not to screw it up.
Ok, fair enough.
The fact that mystical experiences happen at all is proof that the concept wasn't simply invented.
I honestly do not follow.
We experience laser tag, but that doesn't mean that laser tag wasn't invented.
I am not saying that some people might not be having an honest-to-god mystical experience, but there can be other explanations for the experience, such as drugs, food/water deprivation, strong belief (that convinces us we see something when there really isn't anything there), etc.
When I was younger, I was a very devout Christian. I swear to you, after a night of heavy prayer, seeking his will, I saw Jesus appear to me in my room. I can't say for certain whether Jesus actually appeared to me, or whether it was just the invention of my exhausted mind, wishing fervently for an answer.
Yeah, I know. "Discover" is a poor turn of phrase, but I can't come up with anything better.
Ok, you are arguing that humans did not invent the concept of God, passing this theory down through generations, until it became ingrained in our psyche. You are instead arguing that the concept of God is sort of built into our brains, from the get go. Is this a correct analysis?
Uh, no, I'm not. I thought I made it pretty clear that I was referring to a certain type of experience. "God" is just the explanation.
Ok, I didn't get that; thanks for clearing it up.