The Christian sorority we had on my campus was extremely conservative and very "in your face" about it. (They're still on campus, but can't speak as to whether they are still as rude now as they were then.) Their definition of what it means to be Christian is very ... precise. Again, I don't know if this is still the case, but it used to be that they had to approve of the church you went to and checked to make sure you went regularly. There was also pretty long list of things you weren't allowed to do on their website, and I can only imagine how much longer that list must have been in private
