Ah, so whatever someone has faith in must therefore exist?
So we need a new reductio ad absurdum, to demonstrate that you don´t believe in the very standards you are proposing here:
Do Thetans exist? Countless scientologists believe in them.
No, of course not. But if I would, would the FSM suddenly pop into existence?
Are you saying that if I declared the FSM a God it would become real?

The FSM is not a God, I have no affiliation with it, I don´t believe it exists. All this has been explained numerous times to you: The FSM is brought up as a reductio ad absurdum (a perfectly valid epistemological tool).
The FSM is supernatural, and that´s the very point: Declaring something supernatural renders all known methods of discerning its truth value obsolete.
If you can´t even provide a method by which it can be shown that the most ridiculous product of our fantasy and the allegedly most important entity fathomable have different "truth values" (if only they are called "supernatural") we have a serious, unsurmountable problem with the epistemology of the "supernatural". This is obviously the case, or else you wouldn´t have to resort to various logical fallacies in this discussion.