note: she is italian/german and fits the prototypical sterotype i.e.: she is quite the opposite of passive
Is this an indication that this is how she normally communicates? Does she often explode like this?
If so her reaction could be merely her method of communicating.
I told her I had no qualms about it.
You seem like a pretty laid back guy, sometimes this can infuriate people who aren't.
How would she react if you took the wind out of her sails by being even more laid back by saying "yeah, I guess I am an occultist"?
It really does take 2 people to argue so if you experimented with not pointing out how her views may not be strictly rational and not entering into a debate you may remove the oxygen from the flames (so to speak).
My question is this: how can I talk to her and show her, not that she is wrong, but, to be more accepting of different viewpoints.
I would suggest trying this is opening a can of worms that you should avoid. If however you do want to make changes into how she relates to the world you can only do that by changing how you relate to her.
First come up with as comprehensive a list as you can detailing how you react in situations revolving around creationist issues.
Then design a hierarchy from that list from smallest to largest change in how you react to her. Over the course of several weeks or months go up the list (starting with the smallest change) changing how
you react to her and record how that effects her reactions to your lack of belief.
Come up with a rating for your partner on a scale of one to ten for how tolerant she is of other peoples point of view. If she reacts in a relatively positive way (moving up the scale) you know your changes in how you react to her are on the right track.
Only make very incremental behavioural changes in yourself (to affect her) or it won't work and she will dig her heels in.
This does take time but it can work (although it with never completely eradicates the problem) if you take it very small steps.
Hope this helps.