If you believe in God, and he exists: he doesn’t give a damn, because he doesn’t need you.
If you don’t believe in God, and she exists: she doesn’t give a damn, because she doesn’t need you.
If you believe in God, and it doesn’t exist: it doesn’t matter at all, because someone who doesn’t exist cannot care if you believe in it or not, especially when it wouldn’t have cared if it had ever existed.
If you don’t believe in God, and he doesn’t exist: it doesn’t matter at all, because someone who doesn’t exist cannot care whether you believe in him or not, especially when he wouldn’t have cared if he had existed.
Bottom line: it does not matter at all.