The Diversity of the Muslim World
Sunni and Shia, four Sunni schools, and a global community that is not monolithic
There are about 2 billion Muslims today. They live on every continent, speak hundreds of languages, and belong to different legal schools and theological traditions — while sharing the same core of tawhid, the Qur'an, and the Prophet ﷺ. Understanding that diversity is basic literacy.
Overview
What you will learn: the shared core all Muslims share; the Sunni-Shia distinction stated neutrally; the four Sunni schools of law; what Sufism is and is not; and the geographic distribution of Muslims today, which does not match many outsiders' assumptions.
What this means
What all Muslims share: the shahada (the confession that there is no god but Allah and Muhammad ﷺ is His Messenger); the Qur'an as the direct word of Allah; the prophethood of Muhammad ﷺ as the seal of prophets; the five daily prayers; the fast of Ramadan; zakat; and hajj. Muslims of every tradition covered below share these. Differences within Islam are real and old, but they do not touch the core.
What this means
Sunni and Shia. As Lesson 3 (The Rightly Guided Caliphs) covered, the historical split traces to the question of leadership after the Prophet's death in 632 CE. Sunnis (roughly 85-90% of Muslims worldwide) accepted the succession of Abu Bakr, Umar, Uthman and Ali as the rightly guided caliphs. Shias (roughly 10-15%) held that leadership rightly belonged to Ali and his descendants; the largest Shia branch, the Twelvers, holds that there were twelve rightful imams in the family of the Prophet ﷺ, with the twelfth in occultation. Ismailis (including the Nizari community led by the Aga Khan and the Bohra community) are smaller Shia branches. This lesson describes these differences without taking a side; both traditions have long, serious scholarly records.
What this means
Within Sunni Islam, four legal schools (madhahib) have been recognised as authoritative for centuries: Hanafi (largest, dominant in Turkey, the Balkans, Central Asia, South Asia, much of the Levant and Egypt); Maliki (dominant in North and West Africa); Shafi'i (dominant in Southeast Asia, East Africa, Yemen, parts of Egypt and the Kurdish areas); and Hanbali (dominant in the Arabian Peninsula). All four are considered equally valid by mainstream Sunni scholarship — a Hanafi and a Shafi'i are both fully Muslim, following the same religion. The Twelver Shia legal tradition is called Ja'fari.
What this means
Sufism (tasawwuf) is not a separate sect but a devotional and ethical tradition within Sunni and Shia Islam focused on the inward dimension of the religion — sincerity, self-purification, remembrance of Allah — while remaining anchored in Islamic law. The great Sufi orders (Chishti, Naqshbandi, Qadiri, Shadhili, Mevlevi and many others) trace teacher-student chains back through the Prophet ﷺ. Most Muslims through most of history have had some connection to Sufi practice; the movements that reject Sufism outright are historically a minority position, though a visible one in some contemporary communities.
Context
Geography surprises many people. Only about 20% of Muslims are Arab. The four largest Muslim populations by country are Indonesia (about 240 million), Pakistan (about 240 million), India (about 200 million) and Bangladesh (about 150 million) — none of them Arab. Nigeria has approximately 100 million Muslims. Egypt (about 90 million) is the largest Arab Muslim country. Substantial Muslim populations live in China (Uyghurs, Hui and others), Central Asia, the Balkans (Bosnia, Albania, Kosovo), Russia, Europe and the Americas. The 'centre of gravity' of the Muslim world is not the Arab Middle East; it is a broad belt across South and Southeast Asia.
Diversity is not a problem to be solved
Two temptations to avoid. The first is treating any single tradition — one legal school, one country, one language — as 'the real Islam' and the rest as deviations; this is not how classical scholarship treated the four Sunni schools, and it does not match the historical record. The second is treating the diversity as evidence that there is no real Islam at all; the shared core listed at the top of this lesson is real, and Muslims across every tradition covered here are one ummah. The honest position is that the tradition is broad enough to hold many faithful ways of being Muslim, and narrow enough to have a definite centre.
Application today
Ordinary literacy: know the name of the legal school your own family follows and why; be able to say what the Sunni-Shia difference actually is without insulting the other side; be able to name a country with a large Muslim population that is not Arab. That is not scholarship — that is basic knowledge of the community you are part of.
Reflection
Where in your own thinking have you quietly treated one country's or one school's Islam as the default? What would it take to notice that, and hold the wider ummah with more accuracy?