The term Muslim's religion is Islam, which is a monotheistic religion based on the teachings of the Islamic prophet Muhammad. It is the world's second-largest religion and the fastest-growing major religion in the world, with over 1.8 billion followers or 24.1% of the global population. Islam teaches that God is merciful, all-powerful, and unique, and has guided humanity through prophets, revealed scriptures, and natural signs. The primary scriptures of Islam are the Quran, viewed by Muslims as the verbatim word of God, and the teachings and normative example of Muhammad.