Islam is not all "one thing", as is Christianity, Hinduism or Buddhism. There are many schools of thought within it. As with many religions, there are fundamentalists factions and cults, and those are the ones who are dangerous. Those who commit terrorist acts are those who have been indoctrinated to do so by the same processes of indoctrination that are found in cults.
As has been pounded to death, and has been said by the likes of Bill Maher and Sam Harris, Islam is NOT like other religions. The moderate Muslims you and I know are the fringe, not the center. Fundamentalists/cults in other faiths are fringe, not centric. Isam is a rotten death cult at its core, that doesn't change the people you speak of, but you cannot compare it to any other religion in existence today at this time.
Also you can't just reference ISIS as the bar. Human rights violations could be committed by all these you speak of. They may not be attacking people with a knife, how do they treat their wives? How do they feel about apostates? How do they feel about sharia? Homosexuals? Its a much bigger problem than just jihad