"And lest we get on our high horse and think this is unique to some other place, remember that during the Crusades and the Inquisition, people committed terrible deeds in the name of Christ. In our home country, slavery and Jim Crow all too often was justified in the name of Christ." - President Barack Obama at the National Prayer BreakfastThe analogy is deeply flawed. When one looks at the deeds committed in the name of radical Islam, and then look to see what the founder of Islam Mohammed would say about them, you come up with approval.
When you look at the deeds committed by Christians, atrocities committed against non-Christians, and then look at what Jesus Christ, the founder of Christianity, would say - yup, you come up with absolute judgment that such behaviour is wrong.
The trouble is that the religion of Islam doesn't permit its followers to find out about Christ, so they really do think that Mohammed is the supreme leader. A violent man, a pedophile, there is nothing in Mohammed to prove that Islam is a "religion of peace".