Islam is the second-largest religion in the world. Religion estimated followers:
There are two main branches of Islam:
Largest Muslim populations (in millions) by Country
Number of Muslims:
Followers of Islam share a core of basic beliefs on which they base their daily lives.
("shahadah," in Arabic) - "There is no deity but Allah, and Mohammed is his messenger." Followers repeat this phrase several times a day to remind themselves of God's central position in their lives.
("salah") - Muslims are required to pray formally five time a day-at dawn, midday, afternoon, evening and night.
("zakah") - Muslims pay a specified amount of money, typically 2.5 percent of their accumulated wealth each year, to assist the poor and sick.
("sawn") - During the monthlong Ramadan, Muslims are to refrain from eating, drinking, smoking and sexual activities from dawn to sunset.
("hajj") - Islam requires every believer to make at least one visit to Mecca in their lifetime if means are available. More on the Hajj...
More on the Five Pillars...
Prompted by what he says are divine revelations, the Prophet Muhammad begins espousing a new version of pure monotheism in pagan Mecca, a town located in what is now Saudi Arabia.
Muhammad migrates to Medina and establishes an Islamic community. The Muslim calendar begins.
Death of Muhammad.
Islamic rule extends to North Africa, Persia (Iran), Jerusalem, Damascus and Central Asia.
Muslim advance into Europe is halted in France by Christian armies.
Islam's "Golden Age." Under a unified empire, Islamic legal, religious and political thought flowers.
European Christians launch the first Crusade to take the Holy Land from Muslims.
Crusaders conquer Jerusalem.
Mongols conquer the Islamic center of Baghdad.
Islamic forces defeat the last Crusader stronghold in Palestine.
Constantinople (now Istanbul) becomes a Muslim city when it is conquered by the Ottoman Turks.
With fall of Grenada, Muslim rule ends in Spain.
Muslim Turks, controlling much of southeastern Europe, attack Vienna.
The French, under Napoleon, invade Egypt.