““Comparing African and Egyptian circumstances also points to other reasons why churches survived in some regions and failed in others. From earliest times, Christianity had developed in the particular social and economic world of the Mediterranean and the Near East, and networks of church organization and mission followed the familiar routes of trade and travel. Also, this social world was founded upon cities, which were the undisputed centers of the institutionalized church. Mediterranean Christianity was founded upon a hierarchical system of metropolitans and bishops based in cities: even the name metropolitan suggests a fundamentally urban system. Over time, though, trade routes changed and some cities lost power or vanished altogether. Between the fifth century and the ninth, these changes had a special effect on the Mediterranean, as sea routes declined in importance and states tended to look more inland, to transcontinental routes within Asia and Africa. This process was accelerated by the impact of plague, particularly during the 540s, and perhaps of climate change. Cities like Carthage and Antioch shrank to nothing, while Damascus and Alexandria lost influence before the new rising stars of Baghdad and Cairo.11 These changes coincided with the coming of Islam rather than being caused by that event, but they had immense religious consequences. Churches that remained wedded to the old social order found themselves in growing difficulty, while more flexible or adaptable organizations succeeded. Nestorians and Jacobites coped well for centuries with an Eastern world centered in Baghdad and looking east into Asia. Initially, too, the old urban framework adapted successfully to the Arab conquest, and Christian bishops made their peace quite easily. Matters were very different, though, when the cities themselves were faced with destruction. By the seventh century, the decline of Carthage and its dependent cities undermined the whole basis of the North African church, and accelerated the collapse of the colonial social order. Once the cities were gone, no village Christians remained to take up the slack. The Coptic Church flourished because its network of monasteries and village churches allowed it to withstand changes in the urban system.””
