What he's getting at is the claim to believe in God is one that requires complete faith in such a belief.

To myself, and probably him (although I don't want to take words out of his mouth), the belief in God is one of the most unproven and widely accepted beliefs in the world.

If I claim that there are fairies under my garden, you'd think I was insane unless I somehow could show you in person, or photoshopped Tinkerbell from Peter Pan into a picture of my garden. The belief in God is absolutely unproven, and it never will be proven, yet billions of people believe in a God. I for one find it odd.