I'm going to be honest with you here. I have only had one therapist ever mention anything about faith to me, and I wasn't bothered at all because he was my pastor. Philosophically we were on the exact same page.

I would never be able to go to a therapist who was of different Christian beliefs as mine and who felt the need to preach to me. I HATE being preached to, particularly by certain Christians who interpret things quite differently than I do. It would make me just fume.

There is no changing her beliefs. So, can you tolerate the differences? Could you ask her to leave religious discussion out of your sessions as they are triggering for you? If she won't, I'd be thinking of a change. I just wouldn't be able to tolerate it.