Codex of FaithsAn illustrated atlas of belief

7th century CE · Mecca and Medina, in Arabia

How Islam began in 7th-century Arabia with the revelation Muslims believe came to the Prophet Muhammad, what Muslims believe, how they pray and fast, and how the faith spread from Spain to Indonesia.

Began
Mecca and Medina, in Arabia
When
7th century CE
Founder
The Prophet Muhammad (c. 570–632), whom Muslims regard as the last of God’s prophets
Followers
2 billion (2020)
Main branches
Sunni, Shia, Ibadi, Twelver
Scriptures
The Qur’an, The Hadith

In brief

  1. Islam means “submission” to God. Muslims believe that God revealed the Qur’an to the Prophet Muhammad in Arabia between 610 and 632.
  2. Its core is belief in one God (Allah in Arabic), the same God worshipped by Abraham, Moses and Jesus, whom Muslims honour as prophets.
  3. Muslim life is shaped by the Five Pillars: the declaration of faith, prayer, almsgiving, fasting in Ramadan and the pilgrimage to Mecca.
  4. About 2 billion people were Muslim in 2020, about 26% of the world. Islam was the fastest-growing major religion between 2010 and 2020.

From the text

بِسْمِ ٱللَّهِ ٱلرَّحْمَٰنِ ٱلرَّحِيمِ ۝ ٱلْحَمْدُ لِلَّهِ رَبِّ ٱلْعَٰلَمِينَ

Bismi llāhi r-raḥmāni r-raḥīm. Al-ḥamdu li-llāhi rabbi l-ʿālamīn

“In the name of God, the Most Gracious, the Most Merciful. Praise be to God, Lord of the worlds.”

Qur’an 1:1–2, al-Fātiḥa

The holy book

The Qur’an

al-Qur’ān

Language
Arabic
Written
Revealed 610–632, Muslims believe; standard text under the caliph Uthman, c. 650
Contents
114 suras of about 6,200 verses (ayat)

The Qur’an, “the recitation”, is for Muslims the word of God itself, revealed to the Prophet Muhammad through the angel Gabriel over some twenty-two years. Muslim tradition holds that it was memorised and written down by his companions, gathered under the first caliph, Abu Bakr, and issued in a standard text under Uthman around 650.

It has 114 chapters, called suras, each made up of verses, ayat, a word that also means “signs”. Apart from the short opening prayer, al-Fatiha, they are arranged roughly from the longest to the shortest. Scholars traditionally divide them into earlier suras from Mecca, short and urgent, speaking of the one God, the signs of creation and the Day of Judgement, and later suras from Medina, which give guidance on worship, law and the life of the community. The Qur’an retells the stories of earlier prophets, among them Abraham, Moses, Mary and Jesus, and calls its hearers to remember God and do good.

The Qur’an is above all recited aloud in Arabic, in every prayer and in the art of tajwid, careful melodic recitation. Many Muslims learn it by heart, and one who has memorised all of it is honoured as a hafiz. During Ramadan many read or hear the whole text. Copies are handled with respect, often after ritual washing, and kept in a high, clean place. Translations are valued as interpretations of its meaning, not as the Qur’an itself, and its verses adorn mosques in calligraphy.

In pictures

  • Pilgrims circling the Kaaba, the direction every Muslim faces in prayerMasjid al-Haram, Mecca
  • Tilework in the courtyard of a royal mosque built in the seventeenth centuryShah Mosque, Isfahan, Iran
  • The mihrab, the niche that marks the direction of Mecca, framed in gold mosaicMosque–Cathedral of Córdoba, Spain
  • Domes and half-domes lit by hundreds of windows and hanging lampsSultan Ahmed (Blue) Mosque, Istanbul
  • A mosque built in 1910–1913, its minaret a landmark of the Black Sea portCarol I Mosque, Constanța, Romania
  • Painted tiles and calligraphy in the central dome of an Ottoman mosqueBlue Mosque, Istanbul
Photo credits
  1. Masjid al-Haram, Mecca · Tab59, Public domain
  2. Shah Mosque, Isfahan, Iran · Bernard Gagnon, CC BY-SA 4.0
  3. Mosque–Cathedral of Córdoba, Spain · Jebulon, Public domain
  4. Sultan Ahmed (Blue) Mosque, Istanbul · Mustang Joe, CC0
  5. Carol I Mosque, Constanța, Romania · Antonio Gherdan, CC BY-SA 3.0 ro
  6. Blue Mosque, Istanbul · Bjørn Christian Tørrissen, CC BY-SA 3.0

Redrawn for this site as illustrated plates from the photographs above: cropped, recoloured, outlined, and with night skies painted in. The adapted images are shared under the same licences.

Chapter I

The revelation

Islam began in Mecca, a trading town in western Arabia and a place of pilgrimage. Muslims believe that in 610 the angel Gabriel brought the first words of the Qur’an to Muhammad, a merchant of the Quraysh tribe, as he prayed in a cave on Mount Hira. Over the following twenty-two years, the revelations continued.

Muhammad preached that there is only one God and that people will answer for their deeds on the Day of Judgement. Facing hostility in Mecca, he and his followers moved in 622 to the town of Yathrib, later called Medina, “the city of the Prophet”. This migration, the hijra, marks the first year of the Islamic calendar. By his death in 632, most of Arabia had accepted Islam.

Within a century, armies led by the caliphs, his successors, had built an empire from Spain to the Indus. Conversion was gradual: in many lands Muslims remained a minority for generations. Merchants and Sufi teachers then carried Islam along trade routes to West and East Africa, Central Asia, India and Southeast Asia, where it became the faith of most people in Indonesia and Malaysia.

0°40° E80° E 20° N40° N Equator Mecca · 610 Mecca: 610 Damascus · 634 Damascus: 634 Iraq · 637 Iraq: 637 Egypt · 641 Egypt: 641 Al-Andalus · 711 Al-Andalus: 711 Sindh · 712 Sindh: 712 Samarkand · 8th c. Samarkand: 8th c. Swahili coast · 10th c. Swahili coast: 10th c. West Africa · 11th c. West Africa: 11th c. Delhi · 1206 Delhi: 1206 Sumatra · 13th c. Sumatra: 13th c. Java · 15th c. Java: 15th c. From Arabia outward where it began arrival, approximate date N
  1. 610 Mecca
  2. 634 Damascus
  3. 637 Iraq
  4. 641 Egypt
  5. 711 Al-Andalus
  6. 712 Sindh
  7. 8th c. Samarkand
  8. 10th c. Swahili coast
  9. 11th c. West Africa
  10. 1206 Delhi
  11. 13th c. Sumatra
  12. 15th c. Java
Chapter II

Caliphs, sultans and scholars

After the Prophet’s death in 632 the community was led by four caliphs, Abu Bakr, Umar, Uthman and Ali, whom Sunnis call the “rightly guided”. Under Umar, Arab armies took Byzantine Syria and Egypt and overran the Sasanian empire of Persia, and under Uthman a standard text of the Qur’an was issued. The murder of Uthman in 656 began a civil war, the first fitna. After Ali was killed in 661, Mu‘awiya founded the Umayyad dynasty, ruling from Damascus. The Umayyad caliph Abd al-Malik built the Dome of the Rock in Jerusalem, completed in 691–692, and made Arabic the language of government, while conquests reached Spain and Sindh by 711–712.

In 750 the Abbasids overthrew the Umayyads and in 762 founded Baghdad, which became one of the great cities of the world. In the following two centuries the classical shape of Sunni Islam emerged. Scholars founded the schools of law (madhhab) named after Abu Hanifa, Malik ibn Anas, al-Shafi‘i and Ahmad ibn Hanbal, and the great hadith collections were compiled. Greek science and philosophy were translated into Arabic, and thinkers such as al-Kindi and Ibn Sina built on them. How quickly the peoples of the empire converted is debated, but Muslims had probably become a majority in Iran, Iraq and Egypt by around the 10th or 11th century. Political unity did not last: an Umayyad prince ruled al-Andalus from Córdoba, and in 969 the Fatimids, an Ismaili Shia dynasty, founded Cairo and soon the mosque of al-Azhar.

From the 11th century Turkish dynasties held power. The Seljuks entered Baghdad in 1055 as sultans ruling in the caliph’s name and founded colleges (madrasas), where the scholar al-Ghazali (d. 1111) helped reconcile Sufi mysticism with law and theology. Sufi orders took shape over the next two centuries, among them the Mevlevi, inspired by the poet Rumi. Crusaders took Jerusalem in 1099, but Saladin recaptured it in 1187. In 1258 the Mongols sacked Baghdad and ended the Abbasid caliphate there, yet within decades the Mongol rulers of Iran had themselves become Muslim. Islam spread further with the Delhi Sultanate in India, with traders and teachers in West Africa, where Mansa Musa of Mali made a famous pilgrimage to Mecca in 1324, and across the Indian Ocean. In Iberia, the Christian reconquest ended with the fall of Granada in 1492.

Three great empires dominated the early modern Muslim world. The Ottomans took Constantinople in 1453 and, after conquering Egypt in 1517, became guardians of Mecca and Medina. In Iran, Shah Ismail I made Twelver Shia Islam the religion of the Safavid state from 1501, setting Iran apart from its Sunni neighbours to this day. In India, the Mughal dynasty ruled from 1526, its emperors presiding over a largely non-Muslim population.

The 18th and 19th centuries brought movements of renewal and the shock of European power. In Arabia, Muhammad ibn Abd al-Wahhab (1703–1792) preached a strict return to the Qur’an and Sunna and in 1744 allied with the ruler Muhammad ibn Saud. In West Africa, Usman dan Fodio founded the Sokoto Caliphate. By the early 20th century most Muslims lived under European rule: British in India and Egypt, French in North Africa, Dutch in Indonesia, Russian in Central Asia. Responses ranged from modernist reformers such as Jamal al-Din al-Afghani and Muhammad Abduh to traditional seminaries such as Deoband in India, founded in 1866.

After the First World War the Ottoman Empire collapsed, and in 1924 the parliament of the new Turkish Republic abolished the caliphate. Nation states took its place: Saudi Arabia was proclaimed in 1932 and Pakistan was created in 1947 as a homeland for the Muslims of British India. The Muslim Brotherhood, founded in Egypt in 1928, inspired movements seeking a larger public role for Islam, which varied widely in aims and methods. In 1979 a revolution in Iran established an Islamic republic under Ayatollah Khomeini. Migration in the later 20th century created large Muslim communities in Europe and North America.

  1. 610 Muslims believe the first revelation comes to Muhammad on Mount Hira.
  2. 622 The hijra: Muhammad and his followers move from Mecca to Medina.
  3. 632 Death of Muhammad; Abu Bakr becomes the first caliph.
  4. 661 Ali is killed; Mu‘awiya founds the Umayyad caliphate in Damascus.
  5. 680 Husayn, son of Ali, is killed at Karbala.
  6. 762 The Abbasid caliph al-Mansur founds Baghdad.
  7. 969 The Ismaili Fatimid dynasty founds Cairo.
  8. 1258 Mongols sack Baghdad, ending the Abbasid caliphate there.
  9. 1453 Ottoman sultan Mehmed II conquers Constantinople.
  10. 1501 Shah Ismail I makes Twelver Shia Islam Iran’s state religion.
  11. 1924 The Turkish Republic abolishes the Ottoman caliphate.
  12. 1979 Revolution in Iran establishes an Islamic republic.
Chapter III

One God and the Five Pillars

The heart of Islam is tawhid The oneness of God, the central teaching of Islam. Glossary, the oneness of God: God has no partner, no son and no equal. The declaration of faith, the shahada The declaration of faith: there is no god but God, and Muhammad is the messenger of God. Glossary, says: “There is no god but God, and Muhammad is the messenger of God.”

Muslims believe in angels, in the books God revealed (the Torah, the Psalms, the Gospel and the Qur’an), in the prophets from Adam to Muhammad, in the Day of Judgement, and in God’s decree. Life is lived in submission to God, which is what the word islam means.

Practice rests on the Five Pillars: the declaration of faith, prayer five times a day, almsgiving, fasting in the month of Ramadan, and the pilgrimage to Mecca for those who are able. Islamic law, the sharia The path or law of Islam, as worked out by scholars from the Qur’an and the sunna. Glossary, guides worship, family life and ethics, as interpreted by scholars in several schools of law.

12345 Six articlesof faith

Six articles of faith

  1. iOne God
  2. iiThe angels
  3. iiiThe revealed books
  4. ivThe prophets
  5. vThe Day of Judgement
  6. viGod’s decree

The Five Pillars

  1. 1Shahada, the declaration of faith
  2. 2Salat, prayer five times a day
  3. 3Zakat, almsgiving
  4. 4Sawm, fasting in Ramadan
  5. 5Hajj, the pilgrimage to Mecca
Chapter IV

Prayer and fasting

Five times a day the call to prayer sounds from the minaret, and Muslims pray facing the Kaaba in Mecca, wherever they are. Prayer follows set movements of standing, bowing, prostrating and sitting, after washing. On Friday at noon, the community gathers in the mosque for prayer and a sermon.

During Ramadan, Muslims fast from dawn to sunset, taking no food or drink, and break the fast together in the evening. The month ends with Eid al-Fitr. Each year nearly two million pilgrims perform the Hajj in Mecca; its climax coincides with Eid al-Adha, the feast of sacrifice, kept by Muslims everywhere.

Many Muslims also follow Sufism, the mystical path of Islam, with its masters, orders and remembrance of God through chant and poetry.

  • Prayer

    Five daily prayers facing Mecca, called from the minaret; on Friday at noon, congregational prayer in the mosque.

  • Ramadan

    A month of fasting from dawn to sunset, ending with the feast of Eid al-Fitr.

  • Zakat

    An annual alms of 2.5% of savings above a threshold, given to the poor and others in need.

  • Hajj

    The pilgrimage to Mecca, required once in a lifetime of all who are able; millions walk around the Kaaba each year.

  • Recitation

    The Qur’an is recited aloud in Arabic; many Muslims learn it, or parts of it, by heart.

Chapter V

The Qur’an

The Qur’an, “the recitation”, is for Muslims the word of God itself, revealed in Arabic. It has 114 chapters, called suras, arranged roughly from the longest to the shortest. Muslims recite it in Arabic in prayer, and translations are regarded as interpretations rather than the Qur’an itself.

Alongside the Qur’an stands the hadith A report of what the Prophet Muhammad said or did; collections of hadith guide Muslim life. Glossary, reports of what the Prophet said and did. Scholars sifted them for reliability, and the collections of al-Bukhari and Muslim, from the 9th century, are the most respected among Sunnis. Together with the Qur’an, they form the basis of Islamic law.

  • The Qur’an

    Arabic

    114 chapters (suras), believed by Muslims to be the word of God revealed to Muhammad. Gathered into one book within about twenty years of his death.

  • The Hadith

    Arabic

    Reports of the words and deeds of the Prophet, gathered in collections such as those of al-Bukhari and Muslim in the 9th century.

  • The Sira

    Arabic

    The biography of the Prophet, first written by Ibn Ishaq in the 8th century.

Chapter VI

Sunni and Shia

After Muhammad’s death in 632, the community disagreed over who should lead it. The majority accepted the caliphs chosen from among the Prophet’s companions; they became known as Sunnis, followers of the Prophet’s custom (sunna The example of the Prophet Muhammad, in his words and actions, recorded in the hadith. Glossary). A minority held that leadership belonged to Ali, the Prophet’s cousin and son-in-law, and his descendants; they became the Shia, the “party of Ali”.

The killing of Ali’s son Husayn at Karbala in 680 became a defining memory for Shia Muslims. Shia Islam later divided into the Twelver, Ismaili and Zaydi branches. The small Ibadi community, mainly in Oman, forms a third tradition.

Sunni from 632 Twelver from the 9th c. Ismaili from the 8th c. Zaydi from the 8th c. Shia from 632 Ibadi from the 7th c. The first community 610–632
The first community
Mecca and Medina. The Prophet and his companions; the Qur’an revealed and recited.
Sunni
Most of the Muslim world. About 85–90% of Muslims. Follow the “custom” (sunna) of the Prophet and accept the first four caliphs as rightly guided.
Shia
Iran, Iraq, Bahrain, Azerbaijan, Lebanon. About 10–15% of Muslims. The “party of Ali”: leadership belongs to Ali, the Prophet’s cousin, and his descendants, the imams.
Ibadi
Oman, parts of North Africa. A small branch with roots in the early dissenters known as Kharijites.
Twelver
Iran, Iraq, Lebanon. The largest Shia branch; awaits the return of the twelfth imam, hidden since 874.
Ismaili
South Asia, Central Asia, East Africa. Follow a line of living imams; today the largest group is led by the Aga Khan.
Zaydi
Yemen. Named after Zayd ibn Ali; the Shia branch closest to Sunni practice.
Chapter VII

Islam today

About 2 billion people were Muslim in 2020, roughly 26% of the world’s population, according to the Pew Research Center. Islam was the fastest-growing major religion in the previous decade, mainly because Muslims are, on average, younger and have more children.

Most Muslims live in Asia and the Pacific, not in the Middle East. Indonesia has the largest Muslim population, followed by Pakistan and India. Only about one in five Muslims lives in the Middle East and North Africa.

2 billion

Muslims in 2020, about 26% of the world

59 in 100 live in Asia and the Pacific

Share of the population, by region

  • Middle East and North Africa94%
  • Sub-Saharan Africa33%
  • Asia and the Pacific26%

Largest populations

  • Indonesia about 240 million
  • Pakistan 227 million
  • India 213 million

The number of Muslims grew by 21% between 2010 and 2020, more than any other religion, mainly because of a young population. Source: Pew Research Center, 2025.

Clergy and religious life

Who leads, teaches and serves, each drawn in the dress that marks the role.

Symbols

The year

JanFebMarAprMayJunJulAugSepOctNovDec The year most dates follow the moon Ramadan Eid al-Fitr Eid al-Adha Ashura Mawlid
Ramadan →
In 2027 from about 8 February. The month of fasting, when the Qur’an began to be revealed.
Eid al-Fitr →
In 2027 about 9 March. The feast that ends Ramadan: prayers, new clothes, family visits, gifts to the poor.
Eid al-Adha →
In 2027 about 16 May. The feast of sacrifice, recalling Abraham’s readiness to sacrifice his son; held during the Hajj.
Ashura
In 2027 about 15 June. For Shia Muslims, mourning for the martyrdom of Husayn at Karbala in 680; for Sunnis, a day of voluntary fasting.
Mawlid
In 2027 about 15 August. The birthday of the Prophet, celebrated in many Muslim countries.

Questions people ask

Did Muhammad found Islam?

Muslims do not see Muhammad as the founder of a new religion. They believe he was the last in a line of prophets, from Adam and Abraham to Moses and Jesus, who all taught submission to the one God; Muhammad received its final form in the Qur’an.

Do Muslims worship the same God as Jews and Christians?

Muslims believe so. The Qur’an calls Jews and Christians “People of the Book” and speaks of the God of Abraham. Allah is simply the Arabic word for God, also used by Arab Christians.

What is the difference between Sunni and Shia?

The two divided over who should lead the community after Muhammad’s death in 632. Sunnis accepted the caliphs chosen by the community; Shia held that leadership belonged to Ali and his descendants. They share the Qur’an and the Five Pillars but differ in law, rituals and religious authority.

Why do Islamic dates move?

The Islamic calendar is lunar, with twelve months of 29 or 30 days. Its year is about eleven days shorter than the solar year, so Ramadan and the feasts move earlier each year through all the seasons.

Test what you know

8 questions on Islam, each answer explained. More quizzes

  1. Question 1 of 8

    What does the word “islam” mean?

    Show the answer

    Submission to God. Life is lived in submission to God, which is what the word islam means. “The recitation” is the meaning of Qur’an.

  2. Question 2 of 8

    The hijra, the move from Mecca to Medina that begins the Islamic calendar, took place in…

    Show the answer

    622. Muslims believe the first revelation came in 610; the hijra followed in 622, and the Prophet died in 632.

  3. Question 3 of 8

    How many chapters (suras) does the Qur’an have?

    Show the answer

    114. The Qur’an has 114 suras, arranged roughly from the longest to the shortest after the opening Fatiha.

  4. Question 4 of 8

    Which of these is NOT one of the Five Pillars of Islam?

    Show the answer

    Pilgrimage to Jerusalem. The Five Pillars are the declaration of faith, prayer, almsgiving, fasting in Ramadan and the pilgrimage to Mecca.

  5. Question 5 of 8

    Which country has the largest Muslim population?

    Show the answer

    Indonesia. Pew counts 239 million Muslims in Indonesia in 2020, followed by Pakistan and India. Most Muslims live in Asia, not the Middle East.

  6. Question 6 of 8

    Where was Husayn, son of Ali, killed in 680, an event at the heart of Shia memory?

    Show the answer

    Karbala. Shia Muslims mourn the martyrdom of Husayn at Karbala on Ashura.

  7. Question 7 of 8

    What is zakat, the annual alms?

    Show the answer

    2.5% of savings above a threshold. Zakat is given each year to the poor and others in need.

  8. Question 8 of 8

    Why do Ramadan and the Islamic feasts move earlier each year?

    Show the answer

    The Islamic year is lunar, about eleven days shorter. The Islamic calendar has twelve months of 29 or 30 days, so its festivals pass through all the seasons.

Sources and further reading

  1. Pew Research Center, “How the Global Religious Landscape Changed From 2010 to 2020: Muslims” (2025)
  2. Pew Research Center, “Globally, Islam grew faster than all other religions from 2010-2020” (2025)
  3. Encyclopaedia Britannica, “Islam”
  4. Malise Ruthven, Islam: A Very Short Introduction, 2nd ed. (Oxford University Press, 2012)
  5. Jonathan A. C. Brown, Muhammad: A Very Short Introduction (Oxford University Press, 2011)