Your observation is valid, but spiritual experiences of that sort are extremely rare. I was raised in an evangelical church, in a very serious, I might say fanatical, Christian family, and went to church, Bible study, and other church events regularly for many years. Spiritual experiences were a common topic of discussion. But no one in my family ever had one, nor any of my friends. They were things visiting missionaries from Africa talked about. So it doesn't explain the great bulk of religion.