Well, that's a load of bullsh!t. Islam is most certainly at fault. At least christians got their homicidal days behind them by the 15th-16th century. There's nothing to manipulate or corrupt when your life manual tells you this, and you believe it is the literal word of god:
"When the sacred months are over, slay the pagans wherever you find them. Capture, besiege, and ambush them. If they repent, perform prayers and pay the religious tax, set them free. God is All-forgiving and All-merciful."
"Muster against them all the men and cavalry at your disposal so that you can strike terror into the enemies of Allah and of the believers and others beside them who may be unknown to you, though Allah knows them. And remember whatever you spend for the cause of Allah shall be repaid to you. You shall not be wronged."
The first version of the christian manual is nearly as bad, but your god got a mulligan when his Devine Plan required a do-over.