I've been asked to be a godfather. My best friend since 3rd grade has asked me to be godfather to his son. His family is Catholic, but until recently he had not been practicing (he stopped once he moved out of his parent's house). We have had talks, and he was pretty much agnostic athiest. He started dating his now wife about 5 years ago, and since she, and her family, are practicing Catholic, he has been trying to be more spiritual for her. 

I would do anything for his kid, even take him in if need be, and my friend knows that. But, he also knows I'm athiest. I hope the church knows that if the kid ever asks me, Imma be straight up...