All three major western religions have advocated murder of non-believers.
Christians and Jews have done fairly well recently at least not actively supporting the killing of people for their non-belief. But they've killed plenty, and with full support of the books that they call holy.
During this century, the practice of killing and threatening dissenting individuals seems to be quite acceptable to many Muslims.
But there's nothing special about Islam that makes it worse than the others. It looks worse now, but that's only caused by a trick of time; now looks bigger than it is.
Kiling is in the nature of these religions. You can't root it out.