Some Muslims are Sunnis, Arabs, Shias, Shiites, Rods, and Sufis. Sunnis are the largest denomination of Islam, comprising around 85% of the Muslim population. Arabs are an ethnic group that is predominantly Muslim. Shias and Shiites are two branches of Islam that differ in their beliefs and practices. Rods are a minority sect of Shia Islam. Shiah is another term for Shia Islam. Sufis are a mystical branch of Islam that focuses on spiritual growth and development.