Love that Pirsig quote. Zen is top on my list of books to read.
delusion...a persistent false belief held in the face of strong contradictory evidence...
IMO, religious delusion makes a good parallel to non-lucid dreaming (if only because I had a lucid dream last night).
In my dreams, nothing makes much sense. My house looks nothing like my house, my wife may not be my wife, and somehow I can fly! All of these things contradict what I know to be real. It should be a clear sign that I'm dreaming but my mind still perceives it as reality. My mind wants it to be real, right? And usually my nervous system just accepts whatever it's presented in that REM state. To me, it's similar to those who accept a holy book at face value from an early age.
But occasionally I become lucid when I realize something's really not right... and manage to recognize the delusion, convincing myself I'm just dreaming. I know that's not uncommon but I can't help but equate it to becoming aware of the God delusion and taking control of one's own life.