Saudi Arabia's top religious authority said Iran's leaders were not Muslims, drawing a rebuke from Teheran in a harsh exchange between the regional rivals over the annual haj pilgrimage.The war of words on the eve of the mass pilgrimage will deepen a long-running rift between the Sunni kingdom and the Shi'ite revolutionary power.Iranian Supreme Leader Ayatollah Ali Khamenei on Monday criticised Saudi Arabia over how it runs the haj after a crush last year killed hundreds of pilgrims. He said Saudis had "murdered" some of them, describing Saudi rulers as godless and irreligious.Responding to a question by Saudi newspaper Makkah, Saudi Arabia's Grand Mufti Sheikh Abdulaziz Al al-Sheikh said he was not surprised at the comments."We have to understand that they are not Muslims ... Their main enemies are the followers of Sunnah (Sunnis)," Al al-Sheikh was quoted as saying.He described Iranian leaders as sons of "magus", referring to Zoroastrianism, the dominant belief in Persia until the Arab invasion 13 centuries ago.Khamenei met families of Iranians killed in last year's disaster yesterday and called for an investigation into the crush."The evil family tree of the Saudi dynasty does not have the competence to manage the holy shrines," Khamenei said.Al al-Sheikh's remarks drew an acerbic retort from Iran's Foreign Minister, Mohammad Javad Zarif, who said they were evidence of bigotry among Saudi leaders."No resemblance between Islam of Iranians & most Muslims & bigoted extremism that Wahhabi top cleric & Saudi terror masters preach," Zarif tweeted. ..