Founded by Prophet Muhammad in the Middle East in the 7th century CE, Islam is the world's second largest religion with 1.6 billion followers. The Arabic word 'Islam' means 'submission', reflecting the faith's central theme of submitting to the will of God. Followers are called Muslims. Islamic practices center on the Five Pillars of Islam: faith; prayer; fasting; pilgrimage to Mecca; and alms – and include several holidays and rituals. The sacred text of Islam is the Qur'an.