Islam is a monotheistic religion with over 1.5 billion followers worldwide. The five pillars of Islam are the core practices of the Muslim faith: the declaration of faith, prayer five times daily, fasting during Ramadan, giving alms to the poor, and pilgrimage to Mecca if able. Islam provides a complete way of life covering moral, spiritual, social and political aspects. The holy book is the Quran, which Muslims believe was authored by God and revealed to the prophet Muhammad.