Faith is proof because God gives you supernatural faith when He speaks to you.
(Quote from https://realreality.org/downloads/how-god-will-transform-you/)

What God says to you is true. All physical and natural evidence is circumstantial, so it can’t show you the truth. Circumstantial evidence uses rationalizations. Rationalizations use assumptions. Assumptions are beliefs based on nothing but inner concepts and worldviews. You created your inner concepts and worldviews with circular reasoning and confirmation bias. You can’t trust them. That means you can’t trust circumstantial evidence.

You can trust God. God is absolute.