Islam is an Abrahamic monotheistic religion teaching that there is only one incomparable God (Allah)and that Muhammad (sallAllahu 'alayhi wa sallam) is the messenger of God. 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, known as Muslims. Muslims make up a majority of the population in 50 countries. Islam teaches that God is merciful, all-powerful, unique, and has guided mankind 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 (called the sunnah, composed of accounts called hadith) of Muhammad (sallAllahu 'alayhi wa sallam).