Proof of a Religious Belief 

Most, if not all, religious beliefs cannot be proven.

If ever a religious belief is proven beyond all reasonable doubt then that belief would perhaps be called a scientific fact.

The religious beliefs of the Revealed Religions are so far removed from any logic or reason that it is unlikely that any of them will ever be proven.  Faith and superstition about supernatural events are for all practical purposes unable to be proven.

Proof is not the fact that the founder of some Revealed Religion has claimed that God revealed special information to him and only to him a long time ago.

None of the claims about what was Revealed to an individual by God would ever stand up in a court of law.  It is all hearsay evidence.