Islam is an Abrahamic religion founded by the prophet Muhammad. It is currently the world's second largest religion with over 1.9 billion followers. The primary scriptures of Islam are the Quran, believed to be the verbatim word of God revealed to Muhammad by the angel Gabriel. The five pillars of Islam are the shahada (faith in one God and Muhammad as his prophet), salat (praying five times a day), sawm (fasting during Ramadan), zakat (giving alms to the poor), and hajj (pilgrimage to Mecca at least once in a lifetime if able).