Sorry folks,but this question got me thinking. Spirituality is different to us all,there is no set path.This is where it differs from any other religion.I suppose it originated when humans could think for themselves before being indoctrinated to any other way of thinking,when man thought that there must be something else.
This leads me to believe that it is one of the oldest religions around.Perhaps early man had similar unexpected things happen to them,they got together,shared their experiences and spirituality was formed,then it became exaggerated in some ways until you get to where we are today though the main experiences stand out.
Oh,i'm tying myself in knots here so i'll sign off and leave you to come to your own conclusions.