There is nothing new about wars within religions. Christianity endured centuries of vicious sectarian conflict. Today, it is violence within Muslim communities that has become the source of so much human misery. It is time to acknowledge the destruction wrought by proxy wars and terror campaigns between Sunni and Shia across the Middle East. And it is time that political, civic and religious leaders reject sectarian strife. So let’s be clear: This is a fight that no one is winning. A brutal civil war in Syria has already killed nearly 200,000 people, displaced millions. Iraq has come perilously close to plunging back into the abyss. The conflict has created a fertile recruiting ground for terrorists who inevitably export this violence.