There's no need to prove God the Creator to anyone - - let God do it for you! That is, He has already demonstrated who He is in extraordinary ways to all of mankind, but because of foolish pride issues, arrogance & trusting one's educational level, what their idol may have said, or trusting in their own analytical conclusions, or etc., etc., etc., atheist and a majority who believe in God's existence, but are not reconciled to our Father-God, have cut themselves off from God. We need to remember, our Father-God didn't send Jesus to reconcile every person, even though salvation is available to everyone, but Jesus came to reconcile those who earnestly seek to know who He is & is not & have a desire to “get right with God.” If there's someone you'd like to help in their discovery, try to keep in mind they may be superficial, in that, while they have questions it's not necessarily because they actually have a personal interest in learning, but have a ulterior motive.