If you dumbed yourself down any more, you would be wearing a leather football helmet making unintellible groans and drooling into a cup while haphazardly mashing keys on your computer like a kitten chasing hot wheels cars.
Try to follow along. This really isn't rocket science. You started by saying your supposed proof of Heaven lied within one's spiritual experience, and said experience was the only way to ascertain this supposed proof of Heaven. Somebody having what they perceive to be a spiritual experience is a phenomenon wholly unique to and bound by the confines of that person's mind and sensory perception. The existence of this subjective interpretation of a spiritual experience, and the cause they come up with for it cannot be empirically gauged, and thus fails to meet any standard of formal, informal, or mathematical logic whatsoever.
The fact that the perception of a spiritual experience exists is not evidence that that spiritual experience is the result of the intervention of the Christian God (or Allah, or Vishnu or whoever). In fact, spiritual experiences of various faiths have been synthesized in controlled lab experiments using brain stimulation and chemical triggers.
So somebody saying they had a spiritual experience and it was caused by ______ is a statement purely predicated upon FAITH , not logic. If you want to rely on faith, nobody's stopping you. But you will fail every time you pretend it's anything more than that