Believing or not believing doesn't determine whether there is a god, or not.
No, however those who do not believe have come to not believe because of the overwhelming lack of evidence for God's existence. God simply does not exist.
At least with the lottery, we have testible evidence there are winners. With belief in God and the afterlife, we haven't a single shred of verifiable evidence that remotely suggests any of this religious hocus pocus is true.