While there are plenty of complaints to be had about the extremist sect of Islam, ignoring Christianity's own wildly violent history is not the way to make those complaints. Throughout history "radical christians" — or whatever label you want to give them: in this, we have only the power to describe — have committed their own very fair share of truly heinous, horrible things.

The quickest example that many of us — Americans — can ignore is the treatment of the Native Americans, who were often butchered like dogs for their refusal to convert to their invader's religion. There are more back every which way: the Crusades, the Hollocaust (which was defended by Hitler using many of the same pseudo-religious overtones that the jihadists of Islam use). If you want some closer to home, here's a list of 10 neo-christian terrorist attacks in America, by Americans. — Note that it's a Slate article, which means the tone is over-the-top critical, but the important facts are all in order.

Ignorance is no defense; arrogance less of one. Speak out against the extremists of Islam if you want, but it's wrong to act as if our religion is any better—the people who act in its name, unfortunately, in many, many cases are not.