Perhaps, God being the omnipotent being He is decided He only exists for those who believe in Him. After all, the heart of Judeo-Christian theology is faith in Him. Why is faith so important? Because God does not make himself known in this world. God doesn't exist for the atheist or the experimental scientist. There is no objective proof of His existence. Faith confronts this lack of evidence and asks us to believe anyway. Perhaps the Christian and the atheist are both right. God exists, but only for those who believe in Him. The atheist who doesn't believe is also right, as God doesn't exist for him. The atheist disappears like a puff of smoke when he dies, but the Christian lives on due to his communication with God through faith.