I didn't think I'd have anything to offer for this thread but now that I think about it, I did have a Catholic boyfriend. It wasn't an issue, but faith wasn't important to me back then. Now that faith touches so many aspects of my life, there's no way that conflict could be minor. So I think whoever (I think it was Kevin) said that it won't be an issue if you don't make it one was correct. I've constantly said that there'd be too much conflict to even really consider dating someone of a different faith(sect), but just reading this thread, I realize that I did once and it didn't matter (because it wasn't a big deal for me at the time).
I do remember him saying that he wouldn't marry anyone who wasn't Catholic, so we both knew we'd never be together forever--not only was that a dealbreaker for him, but I couldn't believe he only said that to me after I was already his girlfriend. He wasn't the smartest cookie.