Most people I know are not hard-core religious people. They are what I would call 'lightly religious.' So I don't buy the notion that we can't laugh about religion in America.
I think every relationship has a point where you stop and reevaluate. Are you happy? Have you grown together or apart? What do you share interests in? I think that's a normal thing to do but it's so much harder when it's done publicly.
