If you doubt this, it’s your brain playing (more) trucks on you.
So what epistemic force does this “might be” have?
None.
It’s the epistemological equivalent of thinking “But maybe not!” is a refutation of anything.
God is omnipotent. He is capable not only of making Himself known to you, but doing so in such a way that conveys Truth. This should be obvious if one thinks about it.
Only an omnipotent God could convey truth which is evident beyond all doubt.