how can I talk to her and show her, not that she is wrong, but, to be more accepting of different viewpoints.
Judging by your post you basically want to proselytize her with atheism probably the same way she is intending on proselytizing you with her brand of Christianity.
I honestly don't see the relationship working because that area is very sensitive.
You should also not look at it admirably like you're trying to rescue her from her own ignorance.
If it comes up, I would suggest calmly stating that you're not so sure this is a good topic of discussion given how different your belief systems are. If she is receptive to hear what you want to say, try to avoid a lot of emotion and be sure to be thoughtful.
I realize that for you religion may be the enemy, but it would be better if you viewed her more as a victim than a combatant. Be respectful and remember that Jesus is very real to many people. You have no idea what kind of psychological damage it does to people in the form cognitive dissonance when they come to find out much of it is fabricated. Be respectful and sympathetic/empathetic.
"Facts are stubborn things; and whatever may be our wishes, our inclinations, or the dictates of our passions, they cannot alter the state of facts and evidence." --John Adams
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