Great article by Jerry Coyne: If ISIS is not Islamic, then the Inquisition was not Catholic. It's odd to see all religion apologists accusing ISIS of being not Islamic. The opposite is true.
Coyne mentions a blog post by Sam Harris. Here's an excerpt: "As an atheist, I cannot help wondering when this scrim of pretense and delusion will be finally burned away — either by the clear light of reason or by a surfeit of horror meted out to innocents by the parties of God. Which will come first, flying cars and vacations to Mars, or a simple acknowledgment that beliefs guide behavior and that certain religious ideas — jihad, martyrdom, blasphemy, apostasy — reliably lead to oppression and murder?"