1. Mosques are Muslim houses of worship.
2. Mosques also serve as schools, courts, and centers
3. Muslim armies were not the only ones who spread Islam.
4. While Arab Muslims created an empire, rival groups within Islam about who had the right to succeedMuhammed as caliph.
5. Some Muslims used preaching to win followers to their religion.
6. The Shia and the Sunni agreed on the major principles of Islam.