Muhammadanism, also known as Islam, is a monotheistic religion based on the teachings of the prophet Muhammad. It is one of the world's major religions and is the second-largest religion in the world, with over 1.8 billion followers. It is a faith that emphasizes submission to the will of Allah, the one God, and encourages its followers to live a life of peace, justice, and mercy. The core beliefs of Muhammadanism include belief in Allah, the prophets, the holy books, the angels, the day of judgment, and predestination.