The Torah emphasises again and again and again that we have Emunah because of what we saw en masse with our own eyes, Yetzias Mitzrayim and Matan Torah.
That is what differentiates us from the tens of other religions all based on what one person, or at best a few said.
We do not need to feel guilty about not believing anything else like talking fish or dancing mice or whatever else some Hispanic dreamt up no matter how convincing his story is or how many ‘choshuve’ people believe it.