How do you know He can't? I believe in God and I believe He can do whatever He wants. If you disagree that's on you but don't try to act as if your question wasn't answered. You may not accept or like that answer and that is your right but to go post after post and draw false conclusions that can easily be debunked is arguing on purpose. How many times have I said that God knows all but doesn't control all by choice. Yet you keep repeating "How can there be free will if He knows what's gonna happen?" in some form.
Arrogant is you suggesting what God should or should not do to prove His existence to you. Once again it is your choice to believe or not to believe all I ask is that you come with more than circular arguments and demands to make your point.
I like how you know exactly how your "God" works, lol. As for God proving his existence, well I'm sure even YOU had a level of evidence that your God had to satisfy, as very basic as it may have been.