and while I was typing, Amos posted:
"the repeatability of psychological or spiritual states is not the same at all as the repeatability of physical ones. "

This is quite true on the face of it...but it assumes the premise that there IS a 'spiritual' state....and that a spiritual state is different from a psychological state.

as to:

Re the existence of 'soul' - from Webster's Deluxe Dictionary:

SOUL: 1. the immatierial essence, animating principle, or
         actuating cause of an individual life
      2. the spiritual principle embodied in human beings,
         all rational and spiritual beings, and the universe .

....yes, that's what I understand 'soul' to mean, we just differ in thinking that a definition means there is a reality to that which is defined.

We have 'definitions' of Unicorns and werewolves and elves (and Hobbits), but all that means is that there are generally agreed on images, concepts and attitudes about them.....and some people still LITERALLLY believe in werewolves and such....the images are so powerful that it is easy to succumb to them.