Slavery, the Inquisitions, the KKK, the IRA, the Crusades, the Conquistadors, the Thirty Years War, the burning of "witches", heretics, and homosexuals for several centuries, the sack of Magdeburg, the Croatian extermination camps, the anti-Jewish pogroms of the 19th and 20th centuries.
You know what's funny about the Crusades? The Crusaders probably killed more Christians than they did Muslims.
Ethnic cleansing in Central African Republic
I bet you didn't even know that was going on.
And then there was the Bosnian genocide. Another "ethnic cleansing" by Christians against Muslims.
So don't even pretend Islam has the patent on violence.