A core commitment of the citizens towards the religion Islam makes the Islamic world a distinct and coherent civilization.
1. A shared adherence to Islam served as the foundation of that culture.
2. The ulama, an "international elite" that established an educational system to unite a vast and varied culture, were no group more significant in the transmission of Islamic doctrines and customs.
3. Millions of Muslims from all over the Islamic world travel to Mecca every year to perform the pilgrimage known as the hajj.
4. The emphasis on memorizing the Quran in Arabic made it possible for Islam to spread throughout much of the ancient world.
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