I too am involved with a sudo-religious girlfriend. While she doesn't go to church, she did graduate from a catholic high school ( ) and she believes in the whole god/jesus thing. As for me, she knows I pretty much despise religion with a passion and wouldn't even be caught dead inside of one (no church funeral for me). We both respect each others opinions/beliefs and don't try to change one another.

I guess when it comes to relationship issues, you really have to respect what the other side is saying. Don't ever try to help them through anything unless they ask for it. As the old saying goes...you can't help someone unless they want to help themselves.