Heck no — and so what?
The Scriptures are not the last word on the authentic faith. As a bible-believer, you ought to believe that, unless you believe only the parts of the bible you like.
It’s not necessary to “know” anything to be saved. People incapable of reason or self-knowledge are saved all the time.
So if your priest comes along and says you must stand on your head to be saved.....you gonna believe it?
Without Scripture you have no way to determine if what is being said is true or not regarding salvation.