From Ricky Gervais' post, Why I'm an Atheist:

The dictionary definition of God is “a supernatural creator and overseer of the universe.” Included in this definition are all deities, goddesses and supernatural beings. Since the beginning of recorded history, which is defined by the invention of writing by the Sumerians around 6,000 years ago, historians have cataloged over 3700 supernatural beings, of which 2870 can be considered deities.

So next time someone tells me they believe in God, I’ll say “Oh which one? Zeus? Hades? Jupiter? Mars? Odin? Thor? Krishna? Vishnu? Ra?…” If they say “Just God. I only believe in the one God,” I’ll point out that they are nearly as atheistic as me. I don’t believe in 2,870 gods, and they don’t believe in 2,869.

Gervais goes on to talk about the gifts of atheism:

The gifts of truth, science, nature. The real beauty of this world. I learned of evolution -– a theory so simple that only England’s greatest genius could have come up with it. Evolution of plants, animals and us –- with imagination, free will, love, humor. I no longer needed a reason for my existence, just a reason to live. And imagination, free will, love, humor, fun, music, sports, beer and pizza are all good enough reasons for living.

But living an honest life -– for that you need the truth. That’s the other thing I learned that day, that the truth, however shocking or uncomfortable, in the end leads to liberation and dignity.

So what does the question “Why don’t you believe in God?” really mean. I think when someone asks that they are really questioning their own belief. In a way they are asking “what makes you so special? “How come you weren’t brainwashed with the rest of us?” “How dare you say I’m a fool and I’m not going to heaven, f— you!” Let’s be honest, if one person believed in God he would be considered pretty strange. But because it’s a very popular view it’s accepted. And why is it such a popular view? That’s obvious. It’s an attractive proposition. Believe in me and live forever. Again if it was just a case of spirituality this would be fine.

Gervais says the burden of proof is on the believer.

If I came up to you and said, “Why don’t you believe I can fly?” You’d say, “Why would I?” I’d reply, “Because it’s a matter of faith.”