Islam originated in the Arabian Peninsula in the early 7th century CE when the prophet Muhammad began receiving divine revelations from God. The primary beliefs of Islam are that there is only one God, Allah, and Muhammad is his final prophet. Islam is one of the fastest growing religions in the world with over 1.8 billion adherents globally who are known as Muslims. The primary holy text of Islam is the Quran, which Muslims believe is the verbatim word of God as revealed to Muhammad.