Islam is a monotheistic and Abrahamic religion articulated by the Qur'an, a book considered by its adherents to be the verbatim word of God and by the teachings and normative example (called the Sunnah and composed of Hadith) of Muhammad (circa 570–8 June 632 CE), considered by them to be the last prophet of God. An adherent of Islam is called a Muslim.
Muslims believe that God is one and incomparable and that the purpose of existence is to worship God. Muslims also believe that Islam is the complete and universal version of a primordial faith that was revealed many times before through prophets including Adam, Noah, Abraham, Moses, and Jesus. They maintain that the previous messages and revelations have been partially misinterpreted or altered over time, but consider the Arabic Qur'an to be both the unaltered and the final revelation of God. Religious concepts and practices include the five pillars of Islam, which are basic concepts and obligatory acts of worship, and following Islamic law, which touches on virtually every aspect of life and society, providing guidance on topics from banking and welfare, to family life and the environment.
Most Muslims are of two denominations: Sunni (75–90%) or Shia (10–20%). Sizable minorities are also found in Europe, China, Russia, and the Americas. Converts and immigrant communities are found in almost every part of Earth. With about 23% of population as followers, Islam was the second-largest religion and one of the fastest-growing major religions in the world.