[MadPoet]

I can understand why you are worried, because many Catholic's are against dating people who are nonreligious. I used to go to Catholic school, and it's definitely safe to say that some Catholics have negative views on Atheists.

But seeing as your girlfriend hasn't even brought up the topic of your religion or asked you if you are a Christian, I would assume that it obviously isn't something she's too concerned about. If it were a huge factor in her relationships, then chances are she would have questioned you about it already.

So keep that in mind, and try to be open with her. Being open in a relationship is more important than your religious beliefs, at least in my opinion. As long as you respect her beliefs then I am sure she will respect yours.