Everyone is crazy in their own way. There is no rationality strong enough to remove the crazy from people, and smart people over time have formed their own craziness not bound by religion or mysticism.

This site for example is pooh-poohing religion now, but five minutes later will gush over LSD's power to give pseudo-spiritual epiphanies. It used to love stoicism, which was shopworn even in the Victorian age. Probably in a year from now some other retread of old belief system will be rediscovered, maybe EST or Theosophy, or something.