Never call other humans disbelievers!

[Mystic]

You maybe saying that, just for the sake of arguing.  I can't really know if you would actually disbelieve in God if he was proven to you.

Disbelieve in the normal sense of the word, of course not. But then you're not using this normal sense of the word (as evidenced by this thread). You clearly mean something else by "disbelief". If you mean "wilful rejection", then I am a clear disbeliever, no matter how you choose to portray me as. God showing himself to me would not all of a sudden make me desire him, as long as I get to act freely in some manner at least.

I think you should understand the term as Quran meant to what it means per Quran terms. Iblis worshipped God but a moment of rebellion made him a disbeliever and reject all he knew.

It's not that there is no disbelievers, it's just, you can't assess that a person is a disbeliever, unless, clear proofs exist. As for the clear proof, we are living in a time as expressed in Quran "they ask you why not a sign/proof brought down: say the hiding (of it) is for God so wait, we too are of those who wait". We live in age where the guide expressed in "They ask why not a sign/proof brought down, say you are only a warner and for every people there is a guide", the Guide who proves through such clear proofs and miracles, is hidden now and not in the open.

For all I know, when Imam Mahdi comes with clear proofs and my desire hates some of his teachings I rebel against him, while you submit and follow.

We can't know. We are in a dark night, where God has given humanity rest from clear proof of the truth where they don't constantly witness miracles. They are resting from it after they rebelled to a period where Prophet Mohammad and his successors had clear proofs and miracles, but they rebelled or didn't do their duty in supporting them.