Islam was founded by the prophet Muhammad in the 7th century. It has over 1.8 billion followers worldwide. The core beliefs of Islam include the oneness of God, belief in angels/prophets/holy books, and that Muhammad is the final prophet. The five pillars of Islam are the declaration of faith, daily prayer, charitable giving, fasting during Ramadan, and pilgrimage to Mecca. Major divisions are the Sunni and Shia, and Sufism focuses on spiritualism. Islam spread greatly between the 15th-16th centuries and is now a major world religion practiced in many regions.