I never questioned that either. My point is, proving something for a fact is different than not knowing for sure even though you have reason to believe it is true.
For example, my favorite verse on faith is this.
Daniel 3:17:18 Our God whom we serve is able to deliver us from the burning fiery furnace, and he will deliver us out of thine hand, O king.
18 But if not, be it known unto thee, O king, that we will not serve thy gods, nor worship the golden image which thou hast set up.
To place demands on knowing things we can't know for sure and have no power over is a mistake.
Only God knows everything, but man is finite. So, the only plausible relationship between the two is for man to place his faith at some point in a God who knows better, or there is no real relationship between the two.
It's just common logic.
That is why God requires faith.