OK, so let's say Vlad did eliminate all naturalistic possibilities (I don't believe that for a minute, but let's run with it), so we are left with supernatural possibilities.
Here are some supernatural possibilities:
Vlad had an encounter with God
The Evil Leprechaun beamed an imaginary encounter with God into Vlad's head.
Vlad had an encounter with Satan pretending to be God.
What methodology did Vlad use to eliminate the second two possibilities?