Islamic schools and branches

• 1. Introduction

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  Islamic schools and branches represent one of the most intricate webs of theological and legal disagreement in human religious history. Within a single faith community claiming hundreds of millions of adherents, there are divisions so sharp that some groups have declared others to be infidels worthy of death, while other divisions are so subtle that outsiders and even most ordinary believers remain unaware of them. How did a religion born in 7th-century Arabia fracture into this constellation of sects, schools, and movements? What did believers disagree about so profoundly that it produced armed civil war, rival legal traditions spanning fourteen centuries, and movements still emerging into the 20th century? The answers reach back to a single moment of crisis: the death of the prophet Muhammad and the question of who would lead the community he left behind.

• 2. The Original Rupture

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  When Muhammad died, the dispute over who should guide the Muslim community, the Ummah, was not merely political. It carried eternal stakes. Three positions hardened into three movements. Sunnīs held that Muhammad had not appointed a specific successor, and they accepted the private election of his companion Abu Bakr as the first caliph. Shīʿas believed that ʿAlī ibn Abī Ṭālib, Muhammad's cousin and son-in-law, was the rightful heir, and they rejected the legitimacy of the three caliphs who came before him. The Kharijites, whose name literally means "those who seceded", broke from both camps during the First Fitna, the first Islamic Civil War, which began following the assassination of the third caliph Uthman in 656. Kharijite doctrine was the most severe of the three. They adopted a radical approach to takfīr, the practice of excommunication, declaring both Sunnīs and Shīʿas to be either infidels (kuffār) or false Muslims (munafiqun) worthy of death for apostasy. Kharijites had initially supported ʿAlī, but then fought against him and, according to their tradition, succeeded in his martyrdom while he was praying in the mosque of Kufa. With that act, the rupture became permanent.

• 3. Sunnī Schools and Creeds

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  Sunnīs comprise 87-90% of the world's Muslim population, making them by far the largest denomination in Islam. The word Sunnī derives from sunnah, meaning the teachings, actions, and examples of Muhammad and his companions. After the fall of the Ottoman Empire in 1923, no caliph has been as widely recognized in the Muslim world. Within Sunnī Islam, four major schools of jurisprudence took shape, each named after its founder: the Ḥanafī school after Abū Ḥanīfa al-Nuʿmān, the Mālikī school after Mālik ibn Anas, the Shāfiʿī school after Muḥammad ibn Idrīs al-Shāfiʿī, and the Ḥanbalī school after Aḥmad ibn Ḥanbal. All four founders lived in the 8th century CE. A fifth school, the Ẓāhirī, was founded by Dāwūd al-Ẓāhirī in the 9th century. On matters of creed rather than law, three theological schools competed for Sunnī allegiance. The Atharī school held that religious truth lay in strict adherence to the Quran, the Sunnah, and the sayings of Muhammad's companions, avoiding theological speculation; Ahmad ibn Hanbal is regarded as the leader of this traditionalist creed. The Ashʿarī school, founded by Abū al-Ḥasan al-Ashʿarī in the 10th century, taught that comprehending God's unique nature was beyond human capability. The Māturīdī school, founded by Abū Manṣūr al-Māturīdī, also in the 10th century, agreed with the Ashʿarīs on many points but differed on human reason. Māturīdites held that the unaided human mind can recognize major sins like murder and alcohol as evil, without needing divine revelation to confirm it. Ashʿarītes disagreed, insisting that right and wrong cannot be known without revelation at all. The Māturīdites also taught that faith itself neither increases nor decreases, remaining static, while Ashʿarītes held the opposite view.

• 4. Shīʿa Divisions

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  Shīʿa Muslims constitute 10-13% of the total Muslim population, yet they form the majority in Iran, Iraq, and Azerbaijan, and hold significant presence in Syria, Turkey, South Asia, Yemen, Bahrain, Saudi Arabia, and Lebanon. Their central conviction is that ʿAlī ibn Abī Ṭālib was the first rightful Imam and successor to Muhammad, and that Muhammad's family, the Ahl al-Bayt, carry distinguished spiritual and political authority. A 2012 estimate placed Twelvers at 85% of all Shīʿa Muslims, making them so dominant that the word "Shīʿa" frequently refers to Twelvers by default. Twelvers believe in twelve successive Shīʿīte Imams, and are the only Shīʿa school that complies with a hadith in which Muhammad stated he would have twelve successors. The Jaʿfari school of jurisprudence, named after the sixth Shīʿīte Imam Jaʿfar al-Ṣādiq, governs both Twelver and Ismāʿīlī practice. Ismāʿīlīsm is a distinct esoteric branch, heavily influenced by Neoplatonist philosophy, which accepts Isma'il ibn Jafar as the sixth Imam rather than the figure the Twelvers follow. Ismāʿīlīsm later split into Nizārī and Musta'lī branches, and the Musta'lī further divided into Ḥāfiẓi and Ṭayyibi. Ṭayyibi Ismāʿīlīs, known as Bohras, are themselves split among Dawudi, Sulaymani, and Alavi Bohras. The Zaydīs, also called Fivers, follow a school named after Zayd ibn ʿAlī, and by modern times they survive only in northern Yemen. Despite their Shīʿa origin, they have shown a strong tendency to move toward Sunnī mainstream practice.

• 5. Theology's Fault Lines

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  Muʿtazilite theology originated in the 8th century in Basra when Wasil ibn Ata left the teaching lessons of Hasan al-Basri following a theological dispute. His followers expanded on the logic and rationalism of Greek philosophy, seeking to show that reason and Islamic doctrine were inherently compatible. The Mu'tazila tackled questions no other school would: whether the Quran was created or eternal, whether evil was created by God or existed independently, and how to reconcile destiny with free will. Arrayed against them on the question of free will were the Jabriyah, an early philosophical school holding that humans are entirely controlled by predestination, with no genuine choice at all. Their school originated during the Umayyad dynasty in Basra. The first representative of this school, Al-Ja'd ibn Dirham, was executed in 724. Jahm ibn Safwan, another major figure in this tradition, died in 746. On the other side of the free-will debate stood the Qadariyyah, an early group who asserted that humans do possess free will, making them morally responsible for their actions. Their name was used as a term of derision, and some of their doctrines were later absorbed by the Mu'tazilis, while the Ashʿarīs rejected those same doctrines. The Murji'ah occupied a different fault line entirely: they held that only God can judge who is a true Muslim, opposing the Kharijite practice of excommunicating fellow believers. Originating during the caliphates of Uthman and Ali, the Murji'ah produced two major sub-sects, the Karamiya and Sawbaniyya, before fading from historical existence.

• 6. Sufism and Its Orders

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  Sufism is Islam's mystical-ascetic dimension, organized into orders known as Tasawwufī-Ṭarīqah. Its core aim is the purification of the inner self, and Sufis strive to obtain direct experience of God by training intuitive and emotional faculties rather than focusing on legal compliance. The Chishti order was founded by Abu Ishaq Shami, who died in 941, when he brought Sufism to the town of Chisht, about 95 miles east of Herat in present-day Afghanistan. Before returning to the Levant, Shami trained and deputized the son of the local Emir, Abu Ahmad Abdal, who died in 966; under his descendants the order flourished as a regional mystical movement. The Naqshbandi order, founded in 1380 by Baha-ud-Din Naqshband Bukhari, became known for its silent form of dhikr, remembrance of God, in contrast to the vocalized dhikr practiced in most other orders. The Qadiri order takes its name from Abdul-Qadir Gilani (1077-1166), a native of the Iranian province of Gīlān, and has become one of the most widespread Sufi orders in the world, present across Central Asia, Turkey, the Balkans, and much of East and West Africa. The Bektashi order, founded in the 13th century by the Islamic saint Haji Bektash Veli, was heavily shaped by the Hurufi Ali al-'Ala in the 15th century and reorganized by Balım Sultan in the 16th century; its adherence to the Twelve Imams places it under Twelver Shīʿa classification. The Ni'matullahi order, founded by Shah Ni'matullah Wali, who died in 1367, is today the most widespread Sufi order in Persia. Following the 1979 Iranian Revolution, Javad Nurbakhsh brought the order to the Western world.

• 7. Modern Movements

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  Many slaves brought from Africa to the Western Hemisphere were Muslims, and the early 20th century produced a series of distinct Islamic movements within the African-American community in the United States. The Moorish Science Temple of America was founded in 1913 by Noble Drew Ali, born Timothy Drew, and is characterized by a strong African-American ethnic and religious identity. The Nation of Islam was founded by Wallace Fard Muhammad in Detroit in 1930, with a declared aim of resurrecting the spiritual, mental, social, and economic condition of the Black man and woman of America. The Nation of Islam holds that Wallace Fard Muhammad was God on earth and regards Elijah Muhammad, his successor, as the true Messenger of Allah, not the Arabian Muhammad. In 1975, Warith Deen Mohammed established the American Society of Muslims as an offshoot of the Nation of Islam, seeking to bring its teachings closer to mainstream Sunnī practice by establishing mosques instead of temples and promoting the Five Pillars of Islam. The Ahmadiyya Movement in Islam was founded in British India in 1889 by Mirza Ghulam Ahmad of Qadian, who claimed to be the promised Messiah and a subordinate prophet to Muhammad. Ahmadis hold, among other distinctive beliefs, that Jesus survived the crucifixion and died of old age in India. Their perceived deviation from normative Islam has led to severe persecution, particularly in Pakistan, where their Islamic religious practices are punishable under Ahmadi-specific laws in the penal code. The Gülen movement, established in the 1970s as an offshoot of the Nur Movement and led by Turkish Islamic scholar Fethullah Gülen, operates private schools and universities in over 180 countries and approximately 300 schools in Turkey alone, making it one of the most internationally active Islamic educational networks of the modern era.

• 8. The Unaffiliated and the Future

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  A quarter of the world's Muslim population identify as simply "just a Muslim", belonging to no denomination or school. These non-denominational Muslims form the majority of the Muslim population in seven countries: Kazakhstan, where they make up about 74% of the population, along with Albania at 65%, Kyrgyzstan at 64%, Kosovo at 58%, Indonesia at 56%, Mali at 55%, and Bosnia and Herzegovina and Uzbekistan each at 54%. They are found primarily in Central Asia and southeastern Europe. In 1947, the non-sectarian movement Jama'ah al-Taqrib bayna al-Madhahib al-Islamiyyah was founded in Cairo, Egypt, with support from high-ranking scholars of Al-Azhar University, seeking to bridge the divide between Sunnī and Shīʿa Muslims. By the end of the 1950s, Egyptian president Gamal Abdel Nasser had discovered the usefulness of pan-Islamism for his foreign policy, and the movement reached a wider public audience. Ibadi Muslims, the sole surviving branch of the Kharijites who once declared their fellow Muslims to be infidels worthy of death, now constitute the majority of the Muslim population in Oman and significant minorities in Algeria, Tunisia, and Libya, and they too have shown in modern times a strong tendency toward the Sunnī mainstream. The trajectory from the First Fitna of 656 to the present is not a simple story of fracture; it is equally a story of convergence, drift, and reinvention across fourteen centuries.