That is one thing I don't care for in this matter, myself, to debate the existence of God. It's filed under foolish talk, imo. People who have not met God cannot understand such talk, imo. It's like trying to describe the taste of a sapodilla to someone who has never tasted any fruit. The main goal might always be to show them to God, and allow Him to do what He does in revealing Himself to them. Certainly I can do no more.