None of the major faiths is bloodless; history reeks with the gore of their wars and persecutions, all the more disgusting a spectacle for being, in essence, as simple as this: A kills B because B does not agree with A that there are fairies at the bottom of the garden.
People should be left to believe what they like, so long as they harm no one else. Apart from normal expectations of politeness, it is not however clear why people should require their personal beliefs to be treated with special sensitivity by others, to the point that if others fail to tip-toe respectfully around them they will start throwing bombs. From a secular point of view, religious beliefs are at best absurd and at worse dangerous, and the amount of free play they are given in the public domain is a menace. Believed-in fairies should be kept at home as an entirely private matter, and their votaries encouraged to cease taking themselves so seriously that, when irritated by those who differ, they resort to Kalashnikovs. Apart from anything else, such reactions speak little confidence in their own violently-held certainties.

I’d call them dangerously loopy heretics who are well down the slippery slope to hell, Bob. A hell of their own creation, even if you don’t believe in the literal sulfur-and-brimstone variety presided over by a big red guy with horns and cloven hooves. Which these people very likely do, but they think they’re on the side of the angels, which makes them doubly bad.