“Re OBE’s: Why can’t a mundane “computer glitch” of the brain also be regarded as a spiritual experience?”
Well, the term "spiritual experience" usually refers to something that one believes was caused by something external to oneself. It also usually refers to an experience that actually reflects the real state of affairs. If you have an OBE in which you witness something that actually happened, and which you would otherwise not be aware of, I would consider that more spiritual that simply imaging that you witnessed something that did not actaully happen. But if you want to consider OBEs as spiritual experiences even though they are produced completely within the mind without the help of a higher power, and leave the subject with an incorrect impression of what happened, that's certainly your right.
" ‘Ideas on Earth were badges of friendship or enmity. Their content did not matter.’ " -Kurt Vonnegut, * Breakfast of Champions *