This still sums it up better for me than anything else I've read

“God is a metaphor for a mystery that absolutely transcends all human categories of thought. And it’s as simple as that. So it all depends on how much you want to think about it–whether it’s doing you any good, whether it’s putting you in touch with the mystery that’s the ground of your own being. If it isn’t, well, it’s a lie...So half of the people in the world are religious people who think that their metaphors are facts. Those are what we call theists. The other half of people who know that the metaphors are not facts, and so they’re lies. Those are the atheists.”
~Joseph Campbell

I've always thought "do you believe in God?" was pretty much an entirely semantic question.