Well, to be honest, till now, we've only barely talked about that. She once mentionned she had read several books about it, to what I answered 'It looks like a lot of mumbo-jumbo for people pretending to be cool', which I still think it is (something like the discovery of Buddhism in the western world).
But yesterday, she told me she was eager to work in the UK and Ireland, because not only she would be nearer France, but she could find the true roots of this millennia old religion, which made me go 'wth?'. I knew she was somewhat into this, but I would never have imagined she bought the full mythological crap, with the 'Wicca was the first religion on earth' part, and the 'the Church tried to destroy wicca during the witch hunts' one.
So yeah, I'll try arguing for a while. If it doesn't work, I don't know what I'll do. Rational minds seem to face a huge wall when arguing with people who simply reject rational-thinking. That's is kind of sad but at least I will have tried.
I expected someone here would know a bit about Wicca (I think a former moderator was dating or marrying a Wiccan, or maybe it was on another forum), but meh.
Edit: As a lot of people have said, I don't consider Wicca to be worse than any other religion. They seem pretty harmless and the whole thing sound like a benevolent system of belief. Other religions are just as stupid/nut/made up/dillusionnal, and as a fact, I despise any single religious system (though I don't despise all the people who believe in them).
Thing is, in that case, said girl also consider other religions to be a bunch of fairy tales, but when it comes to Wicca, 'it's all proven, white magic, millennia old, secret alphabet and what not, it's all written down, and the fact we can't find any archeological proof doesn't mean it doesn't not exist' (in a typical 'you can't prove God doesn't exist' fashion). Quite terrible.
What is even more terrible is the people who write these books and think they're historians and what not, while Gardner's writing and journal, in which he clearly states he invented Wicca out of his bottom and a few old-women tricks, are known and available.
Wakizashi, that's all nice and dandy, but most of the people who pretend to be wiccans are these young people (not necessarily teenage girls, but generally young) who learnt Wicca by themselves according to one of the various 'Wicca for dummies' or 'Wicca 101' books available anywhere on teh internet. The people who actually do the coven thingy (which is also pretty laughable) are a tiny minority.
Bookmarks