On a serious note OP, I was in this same situation in a previous relationship. She also wanted me to start going to church with her, her situation was slightly different and her parents plus younger brothers were really into it.
I, on the other hand was not into it and I have never been the religious kind. Long story short we broke up and left it at that. If you are not willing to go, its possible she will use this against you.
I, on the other hand was not into it and I have never been the religious kind. Long story short we broke up and left it at that. If you are not willing to go, its possible she will use this against you.

