@contrex,
Your comment assumes that Americans are "worse" in such matters than other people. I think it entirely reasonable to assume, for example, that there are religious nutters in England--there certainly are elsewhere in the English speaking world. Here in Canada, we get the door-to-door Jesus crown all the time. The recent (last roughly thirty years) creationist/intelligent design movement got its start in Australia. Mel Gibson's father moved to Australia to be with other fundamentalist Catholic nutters like himself. (He seems to have been disappointed--one is tempted to assume that the fundamentalist Catholic nutters in Oz were not nutters enough to please him.)
For religious extremism, you can't do better than several of the more militant Muslim groups, whether Sunni or Shi'ite. Your assumptions about Americans seem to me to be part and parcel with your oft expressed contempt for the United States, Americans and all things American. It may surprise you to learn that the rest of the world is not exactly enamored of the United Kingdom or the English.