It's a crapshoot. Any 'proof' a given sect might offer a prospective convert can be met by another one. Every religion worth its salt has scriptures, prophets, and miracles to boast of.
"Oh, you've got a holy book?" Says the Catholic. "Well, I see your holy book and raise you an apparition of the virgin Mary!"
"Apparitions?" the pentecostal cuts in. "I see your phony apparition and raise you spontaneous remission of my aunt's brain tumor and my pastor dancing with rattle snakes while chugging a gallon of strychnine!"
And so it goes...
In terms of 'evidence' they are all on equal footing.