Just decided this would be pretty fun, and you know, if it works, you're going to have a lot less trouble later on. I'll start:
Are you Russel's Teapot? Because you are out of sight!
Are you a diety?
Because you look unreal.
:P i know that was bad
I've always liked this one:
How much does a polar bear weigh?
Enough to break the ice. Hi, I'm Brent...
"Hey there. Have you been touched by the great noodly appendage?"
No way that can go wrong.
One of the jokes/goth pick-up lines that is still my favorite is:
"Nice boots. Wanna fuck?"
I suppose this could be altered for atheist uses. Suggestions as for altering?
"Nice genes. Wanna fuck?"