The term RELATING TO THE MUSLIM FAITH can be summarized by the word ISLAMIC, which is a seven-letter word. Islam is a monotheistic religion that was founded in the 7th century CE by the Prophet Muhammad in the Arabian Peninsula. It is the second largest religion in the world with over 1.8 billion adherents. ISLAMIC beliefs and practices are based on the Quran, which is the holy book of Islam, and the teachings of the Prophet Muhammad. ISLAMIC law, or Sharia, governs many aspects of life for Muslims, including religious observance, family life, and business transactions.