No one believes in God.
"I suppose belief," wrote Thomas Jefferson, "to be the assent of the mind to an intelligible proposition."
Does anyone believe that "slithy toves gyre and gimble in the wabe"? No. We neither believe it or disbelieve it; we can't assent to it or dissent from it, simply because we don't know what it means.
Theologians and skeptics agree on one thing: that no mere mortal can really understand the core tenets of monotheistic religion – things like "God created the universe" and "Jesus loves you". These are not intelligible propositions; and therefore, they cannot be believed.
(People say, "You can't tell me that I don't believe in God. I feel it in my heart." But this is a non-sequitur. A feeling, no matter how strong, is not a belief.)
Therefore, to argue over whether one "should believe in God" is to miss the point. That is not a choice we get to make. Belief in God is not possible. It can't be done, and therefore no one does it. When people say "I believe in God" they are not reporting a belief. They are repeating an empty slogan. No one believes in any god. Not really.
Many repressive practices – preventing one's children from learning about evolution, for example; or forcing one's wives and daughters to live in a cloth bag – are justified by reference to someone's "sincerely held beliefs". But no one really holds such beliefs. Religious excuses are meaningless and should be ignored.