Islam is an Abrahamic monotheistic religion teaching that Muhammad is a messenger of God. It is the world's second-largest religion with 1.9 billion followers, or 24.9% of the world's population, known as Muslims. Muslims make up a majority of the population in 49 countries. 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, believed to be the verbatim word of God, as well as the teachings and normative examples of Muhammad. Muslims believe that Islam is the complete and universal version of a primordial faith that was revealed many times before through prophets such as Adam, Abraham, Moses, and Jesus. Muslims consider the Quran, in Arabic, to be the unaltered and final revelation of God. Like other Abrahamic religions, Islam also teaches a final judgment with the righteous rewarded in paradise and the unrighteous punished in hell.