I have been reading David Brooks of the New York Times writing about the Religion of Fundamentalism. Almost all religions have their own fundamentalist groups. They have so much in common that they could be their own religion. I do not mean to paint all people who identify themselves as fundamentalist with the same brush, but most follow the same pattern.
Christian, Jewish, Muslim, Buddhist or Hindi fundamentalists see themselves as the "True Faith." They are literalist and are not tolerant of any one who does not think like they do. They lack compassion for those who are different and unwilling to convert. Often, they are willing to kill those who are different, seeing them as a threat to the true religion. Quite often they attack members of their own faith who are moderate.
As one who has studied world religions, it appears to me that fundamentalists become so ridged that they wind up going against the founder of their faith in order to promote the narrow view of their particular group. The preaching of hate and killing in the name of god must be countered by faithful people of all religions who know that the true faith preaches love God, love others, and get the word out.