Consider the following argument:
1. If God exists, then s/he always chooses what is right and good,
2. If God always chooses what is right and good, then s/he would give every person’s soul an equal chance to learn about God and going to heaven.
3. But God does not give every soul an equal chance to learn about God and go to heaven. (After all, some people never learn about God, or are trained to believe in either false Gods or no God at all.)
4. Thus, God does not always choose what is right and good.
5. Thus, God doesn’t exist.