The Muslim religion is also known as Islam. It is one of the world's major religions, with over 1.8 billion adherents worldwide. It is based on the teachings of the Prophet Muhammad and is centered around the belief in one God. The five pillars of Islam are faith, prayer, charity, fasting, and pilgrimage. Muslims believe in the Day of Judgment and the afterlife. They also believe in angels, prophets, and holy books such as the Quran.