This is the result of god-belief.
No, not specifically Islam: GOD-BELIEF. Everyone who believes in god(s), and in particular everyone who, like Muslims, believes in the "God" of Abraham--that would include Christians and Jews--gives aid and comfort to this kind of madness.
Atheists have killed many people. Very few have been killed in the name of atheism.
God-believers have killed many millions of people, in the name of their imaginary "deity"--belief in which has "excused" the believers' uncountable acts of robbery, torture, rape, and murder.
Don't kid yourself that you're a "moderate" believer: these murderers are just believing more purely, more consistently, more religiously in the same "god" that you follow. And the culture that you help maintain--a culture that sees this kind of belief in an imaginary friend as anything other than something to be scorned, mocked, and ridiculed--had helped these monsters do their murderous work.