BEIRUT — The stabbing of author Salman Rushdie has laid bare divisions in Lebanon’s Shiite Muslim community, pitting a few denouncing the violence against fervent followers of the Iran-backed Shiite militant Hezbollah group who have praised the attack. The religious edict, or fatwa, urging Muslims to kill Rushdie was issued in 1989 by Iran’s then-spiritual leader, Ayatollah Ruhollah Khomeini, who …