In case you need 10 really good arguments against the existence of god, here they are.
It is not up to atheists to prove that God does not exist. It is up to believers to prove that he does. And in the absence of any good, solid evidence or arguments in favor of God’s existence — and in the presence of a whole lot of solid arguments against it — I will continue to be an atheist. God almost certainly does not exist, and it’s completely reasonable to act as if he doesn’t.