My wife is a Christian and I am not. When we first started to go out, she tried *really* hard to convert me. I told her I was fine with her going to church, but I make my own choices. Either accept me as I am or we are through. She is (now) fine with that (though I'm guessing she prays that someday I'll see the light
)
We have made quite a few friends at her local church and they are all aware (even though I occasionally attend with her) that I am not a christian. Most of them have refrained from trying to convert me as well.
It really is something that can be worked around - but it is pretty quickly clear if this is going to be a showstopper.