Bit of a grey area in the "Dark Ages" - up until the 11th Century you can legitimately call it the "Roman" Empire - It was the Eastern Empire which lost North Africa to the Muslim Arabs, not the Germanic Barbarians.
Um - no Rome fell to internal decay and a lack of a machinery to manage a large Empire effectively, Edward Gibbon's thesis that the Christians were to blame is down to his attempts to excuse the Muslims (with Gibbons, also originates the attribution of the Alexandria-burning to Christians in the 4th Century).
The adoption of an apocalyptic-salvation religion is a symptom of the decline, not a cause.
In France, Spain, Italy - they speak Latin, they are nominally Roman Christians. In North Africa - they speak Arabic, they are nominally Muslims.
I'm not talking about physical destruction, physical genocide, I'm talking about a massive cultural shift, where the previously similar people in Carthage and Rome have become cultural divorced. That is the destruction of the Roman Empire, not episodes of mass-burnings.
I'm also talking here about cultural memory, not historical wars. Ask a Spaniard about the Reconquesta, or a Greek about Hagia Sophia.
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