I'm not sure if Mayhem's ever been to Israel but I'm pretty sure that they would have their followers there. Mayhem has never been anti-Christian per se. Their ideaology has always been geared against organised religion as a whole, but clearly there are other bands who are vehemently (and specifically) anti-Christian. One of the main problems with black metal is that many people who are involved with it believe that ideology is as important as the music (perhaps more so). I've seen arguments elsewhere in which this has come up. Typically, other forms of metal don't conform to a certain ideological model. Grindcore started as a socialist-leaning political movement in the north of England but now it's just another form of music. Thrash and death and everything else though have never been about specific beliefs or lines of thought. Black metal however has always been about its ideologies of anti-religion, right-leaning paganism and misanthropy. So is it a musical movement, or a political/religious one? Sometimes it seems confused about this itself. For a scene that claims to be iconoclastic and nihilistic by its very nature, it has a mythology and hero-system of its own that is bizarre in the extreme.