IslamIslam (ˈɪslɑːm; ۘالِإسْلَام, al-ʾIslām ʔɪsˈlæːm, ) is an Abrahamic monotheistic religion centered on the Quran and the teachings of Muhammad. Adherents of Islam, called Muslims, number approximately 2 billion globally and are the world's second-largest religious population after Christians. Muslims believe that Islam is the complete and universal version of a primordial faith that was revealed many times through earlier prophets such as Adam (believed to be the first man), Ibrahim, Moses, and Isa (Jesus), among others.
Twelver Shi'ismTwelver Shīʿism (ٱثْنَا عَشَرِيَّة; DIN), also known as Imāmiyya (إِمَامِيَّة), is the largest branch of Shīʿa Islam, comprising about 85 percent of all Shīʿa Muslims. The term Twelver refers to its adherents' belief in twelve divinely ordained leaders, known as the Twelve Imams, and their belief that the last Imam, Imam al-Mahdi, lives in Occultation and will reappear as the promised Mahdi (المهدي المنتظر). Twelvers believe that the Twelve Imams are the spiritual and political successors to the Islamic prophet Muhammad.
MahdiThe Mahdi (al-Mahdī) is a Final Leader in Islamic eschatology who is believed to appear at the end of times to rid the world of evil and injustice. He is said to be a descendant of Muhammad who will appear shortly before the Prophet ʿĪsā (Jesus Christ) and will lead the Muslims to rule the entire world. Though the Mahdi is not referenced in the Quran, and is absent from several canonical compilations of hadith – including the two most-revered Sunni hadith collections: Sahih al-Bukhari and Sahih Muslim – he is mentioned in other hadith literature.
BábismBábism (a.k.a. the Bábí Faith; بابیه) is a religion founded in 1844 by the Báb (b. ʻAli Muhammad), an Iranian merchant turned prophet who taught that there is one incomprehensible God who manifests his will in an unending series of Manifestations of God. It has persisted into the modern era in the form of the Baháʼí Faith, to which the majority of Bábís eventually converted. His ministry was turbulent and short lived, ending with his public execution in Tabriz, and a campaign of extermination that killed thousands of followers in what might be the bloodiest actions of the Iranian military in the 19th century.
AlevismAlevism, Anatolian Alevism or Qizilbashism (æˈlɛvɪzəm; Alevilik, Anadolu Aleviliği or Kızılbaşlık; Elewîtî, Rêya Heqî; Ələvilik, Qızılbaşlıq) is a heterodox Islamic tradition, whose adherents follow the mystical Islamic teachings of Haji Bektash Veli, who is supposed to have taught the teachings of the Twelve Imams. Differing from Sunni Islam and Usuli Twelver Shia Islam, Alevis have no binding religious dogmas, and teachings are passed on by a spiritual leader as with Sufi orders.