you can tell your buddy that it had been observed there is a strong similarity to the "religious" experiences written about by prophets,saints so forth and the experiences you have on acid. there was a book written called the magic mushroom and the cross that takes actual personal descriptions of both religious and acid/mushroom/peyote/mescalin "enlightenments" and you cant help but notice how similar they are. but you are right, as one old acid head to another, he has nothing to compare it to. you have just have to be there to experience it!