Islam is a monotheistic Abrahamic religion originating with the teachings of Muhammad (a 7th century Arab religious and political figure). The word Islam means "submission", or the total surrender of oneself to God (Arabic: الله, Allāh). An adherent of Islam is known as a Muslim, meaning "one who submits (to God)". 

Muslims believe that God revealed the Qur'an to Muhammad, God's final prophet, and regard the Qur'an and the Sunnah (words and deeds of Muhammad) as the fundamental sources of Islam. They do not regard Muhammad as the founder of a new religion, but as the restorer of the original monotheistic faith of Abraham, Moses, Jesus, and other prophets.  

There are between 1.1 billion and 1.8 billion Muslims, making Islam the second-largest religion in the world, after Christianity. 1.1 to 7 million in the U.S. About 21% of all people on Earth follow Islam. The religion is currently in a period of rapid growth. If current trends continue, Islam will become the most popular world religion sometime in the mid-21^st century.