<human>: There's a girl I have known for several years that I had always suspected may have a thing for me, but for a number of reasons I never paid it any mind. I actually like this girl, but I have a tendency to over-think people's interactions, so just wrote it off as friendliness.

Jump ahead several years later, and she has been surprisingly...ubiquitous on my Facebook profile. She likes nearly all of my statuses (which are not many) and frequently comments. As a result of this behavior, I decided to start chatting with her.

Long story short, things have been going pretty well, and she has been very responsive. The problem? I met her at Mass with another friend of mine all those years ago (I was religious at the time, but not Catholic). She's really great, and we seem to get along well. But...I feel like this whole atheism thing could throw a wrench in that. And that's fine if that's the case. However, I don't want to bring it up if it's not necessary, but I also don't want to put in all this effort only to leave her unwilling to even be a friend. I get enough of that in my daily life. What should I do?

I should note that I am not particularly subtle about my atheism on Facebook, be it in status or on my profile. I realize, though, that doesn't mean much. 

I wanted to add that, personally, I am concerned these religious differences will compound and are going to affect what we both *could* have in common, presuming the relationship progresses to that point.

Can you condense the text into a few key points?
<bot>: I'm an atheist and my friend is Catholic. Not sure if she knows, and I'm worried it could impact future relationship potential.