Most of the civilized world was outraged by the killing of 12 journalist/cartoonists. Their magazine specialized in biting satirical articles and cartoons meant to offend everyone, especially the religious. For the freedom to publish this offensive material, they paid with their lives. But this is just the latest example of death in the name of religion.
Violent religious conflict can be seen in the old Testament, where the Jews spared no one in their march to the promised land. On the orders of a Pope over a million Muslims were slaughtered by the Crusaders. Shiite and Sunni have been killing each other over 1200 years. Over 3 million died in Europe during the "Thirty Years War" between Protestants and Catholics. Hundreds of thousands died as Hindu and Muslims engage in mutual genocide after India's independence. The list is as long as the history of the human race.