But mystic experiences, caused by psychedelics (or other neurological "happenings"), may well be one of the reasons why some highly intelligent people remain/ or become religious.

I can personally support this. I've never taken LSD or any other consciousness-altering drug, but I can trigger ecstatic, mystical "religious experiences" fairly easy in other ways; even just singing in a group setting will do it. I sing in an Anglican church choir and this weekend is Easter, so I expect to have quite a number of mystical experiences. At one point I attended a Pentecostal church regularly and was willing to put up with people who didn't believe in evolution because group prayer inevitably triggered my "mystical experience" threshold. (My other emotions are also triggered easily: I laugh out loud when reading alone, cry out loud in sad books and movies, and feel overpowering warm fuzzies when in the presence of small children.)

I have done my share of reading "absurb and useless" books. Usually I found them, well, absurd and useless and pretty boring. I would rather read about the neurological underpinnings of my experience, especially since grokking science's answers can sometimes trigger a near-mystical experience! (Happened several times while reading Richard Dawkins' 'The Selfish Gene'.)

In any case, I would like to hear more about your story, too.