I agree with kaijyuu.
In my limited experience with ladies of the Christian persuasion, they had a ton of religious baggage about sex and relationships and even if we had gotten past it somehow it would just eat her up inside, and all her friends / family / churchgoers would be constantly meddling and badgering her about how she's giving up God for some guy who isn't even Christian.
Again, my limited experience, I'm sure not everyone's like that.
Don't worry; she'll find somebody that fits her brand of crazy and you'll find somebody that fits yours. Don't go hoping for some kind of soul mate, but you don't need to stick with someone despite them religiously pushing you away.
Plus you're probably friendzoned already based on your short description. At best, she's interested in you too but wouldn't be able to bring herself to act on it, and if she did she's hate herself and get recrimination from her peeps as above, etc.
Side note: my girlfriend is Wiccan and I'm nonreligious. We don't have a problem with it. It's ok because we're not evangelists constantly haranguing each other. If she died I'd be willing to organize a Wiccan ceremony, just as if I die she'd be fine sending me to the county furnace to be incinerated and shoveled out.
I think willingness to spend a lot of time together, and wanting the same things out of life, and being committed to supporting each other, are more important than religion or politics. I suspect it's just that most couples end up arguing about religion or politics and it grates on them that the other one doesn't agree, and when someone does meet up with a person who doesn't argue about that stuff it's like a one in a million match.