The catastrophic contradiction of mis-understanding Jesus words that your people did is when your popes strongly urged them for the brutal massacres against Muslims in Jerusalem and whole levant region under the name of "HOLY WAR". Coming from the popes themselves?! Thats what I call catastrophic contradiction.
Yes, Christians did eventually develop a doctrine of self defense, but I'm not aware of Popes who said to slaughter non-believers.
Perhaps you and shafique are confusing Christianity with Islam, where the Koran says that Muslims who kill non-believers will be rewarded with paradise?
The Islamic version of forgivness appeared when Salahuddin have sent back the crusaders peacfully back to their homes in Europe without harming them.
Salahuddin wasn't all that forgiving when he massacred POWs whom he believed should have fought to the death. If you want to find more examples of Muslims during Salad-din's day killing non-Muslims, then look no further to Baybar's massacre of the inhabitants of Antioch, where his troops were allowed in without a fight and his forces shut the gates behind them and massacred every man, woman, and child in the city.
(Oh, and if you were interested in history, you might want to learn about how standing armies treated cities that resisted them - pillaging a city didn't start with the crusaders, but since they did it, I can understand your desire to blame this on Christian theology - Muslims during the time of the prophet Muhammad and Caliphs were no better)
But who gets a bony finger wagged at them?