The term RELATING TO A RELIGION can be solved with the seven-letter word ISLAMIC. Islam is a monotheistic religion that was founded in the 7th century CE by the prophet Muhammad. 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 Muslims believe to be the word of God, and the teachings of Muhammad. ISLAMIC law, or Sharia, governs many aspects of life, including marriage, divorce, inheritance, and criminal justice.