-Shi'ite-
is the second largest denomination of the Islamic faith after Sunni Islam. Shias adhere to the teachings of Muhammad and the religious guidance of his family (who are referred to as the Ahl al-Bayt) or his descendents known as Shi'a Imams. By some estimates, approximately 15-20% of the world's Muslims are Shia. There are an estimated 130 to 190 million Shia Muslims.Shia Islam, like Sunni Islam, has at times been divided into many branches; however, only three of these currently have a significant number of followers. The best known and the one with most adherents is the Twelvers which have a large percentage in Iran 90% and Iraq; the others are Ismaili, Sevener, and Zaidiyyah. Alawites and Druzes consider themselves Shias, although this is sometimes disputed by mainstream Shias. The Sufi orders among the Shias are the Alevi, Bektashi, Kubrawiya, Noorbakhshi, Oveyssi, Qizilbashi, Hamadani and Fatimid orders and denominations. Twenty percent of Turkey's population is Alevi while Lebanon and Syria have a large presence of Druze and Alawites.