Islam is the sixth-largest religion in the world. It is based on the teachings of the Quran, which were revealed to Prophet Muhammad by the angel Gabriel. It is a religion of worship, and its followers are called Muslims. Islam teaches that there is only one God and that He created the universe and mankind. It also teaches that Muhammad is the last messenger of God and that the Quran is the last revelation from God. Muslims believe in the Quran, the Sunnah, and the prophet Muhammad. They also believe in the Quran as the only divine revelation, the Sunnah as the only divinely revealed law, and the prophet Muhammad as the only prophet.