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ISIL's focus on justifying killing Shiites is because it is being pressed by Shiite forces in Iraq and Syria, iSIL is hoping to enlist Sunnis by framing its jihad as part of a prophetic battle where the Shiites and Jews eventually unite behind the Antichrist. Fanning the flames of the Sunni-Shia split, which dates to shortly after the death of Mohammad, benefits ISIS by helping it recruit Sunnis, Mauro said. And the terror group's leadership appears to believe a final battle has been prophecized. Worldwide, Sunnis make up about 85 percent of the world’s 1.6 billion Muslims. Sunnis, who believe the true lineage of Mohammad lies with those who most closely followed his teachings, control powerful Muslim nations including Saudi Arabia, Egypt, Turkey and Pakistan. In addition, most Muslims in Africa are Sunnis. Shia Muslims are a relatively small minority of Shia Muslims, concentrated in Iran and Iraq. Shia Muslims believe bloodlines, not devotion, dictate the prophet’s line of successors. Throughout history, Shia Muslims have rejected the authority of Muslim leaders elected by the people, instead following a line of clerics Shia Muslims consider to have been appointed by Mohammad or Allah. The divide goes back to the period following Mohammad’s death in 632, when his close confidante Abu Bakr became the first Caliph of the Islamic nation. Shias believed the rightful heir was Mohammad’s cousin and son-in-law, Ali bin Abu Talib. Both sects have spawned more than their share of terrorists, though the terror organizations operate differently. Al Qaeda, ISIS, Al-Shebab and Boko Haram are Sunni organizations, while Iranian-sponsored terrorist groups, including Hezbollah, are Shia. The 13th issue of Dabiq, a copy of which was provided to FoxNews.com by the Middle East Media Research Institute( MEMRI), is titled The Rafidah : From Ibn Saba' To the Dajjal. The Rafidah is derogatory term for Shia Muslims that translates to.