Catherine is in Girl Scouts, and we've discussed the Promise, which in part reads, "I will try to serve God* . . ." That asterisk is in the GSA original, by the way - and it is one reason I'm ever so glad to have only girls. The GSA doesn't discriminate, and they specifically allow for substitution of whatever word works for you there.
So I told Catherine, since we aren't religious and her dad and I don't believe in any gods, maybe she would like to substitute another word there. She told me she does believe in God. So I asked gently what "god" meant to her. She said, "It doesn't mean anything. I mean, it means something, but it doesn't really mean anything." Perhaps someday she'll be a Supreme Court Justice!
Seriously, I'm fine with her just going with the flow for now. She's 6! And I figure I'm better off letting her explore her own ideas than coming down on her just like a fundamentalist Christian would on his kid for doubting the family's beliefs.