Christianity is not immune, my friend.
The Catholics have the Seige of Beziers ('Kill them all, God will know his own'), and the Inquisitions. Catholics and Heugots killed each other in God's name. The 30 Years' War was Catholic v. Lutheran. Mormons killed, and were killed, including innocents.
Even today we find Christians who want to kill every Muslim man, woman, and child.
Count me in with this group. Islam is a cancer, it needs to be eradicated. The women are little more than "jihadi factories", and the children have their minds poisoned from birth with their "teachings".
As far as I'm concerned, there is no such thing as an "innocent" muslim.