On his eighth trip to fight with the rebels in Syria, in August, Abu Khattab saw something that troubled him: two dead children, their blood-soaked bodies sprawled on the street of a rural village near the Mediterranean coast. He knew right away that his fellow rebels had killed them. Abu Khattab, a 43-year-old Saudi hospital administrator who was pursuing jihad on his holiday breaks, went to demand answers from his local commander, a notoriously brutal man named Abu Ayman al-Iraqi. The commander brushed him off, saying his men had killed the children “because they were not Muslims,” Abu Khattab recalled recently during an interview here. It was only then that Abu Khattab began to believe that the jihad in Syria — where he had traveled in violation of an official Saudi ban — was not fully in accord with God’s will. But by the time […]