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I am working on an alternate history setting in which the Roman Empire collapses early and leaves behind a number of pagan successor states. An idea I had was a parallel to the Reconquista in which a Christian Berber state invades the Iberian peninsula and forms the Kingdom of Mauritania-Hispania, to then be slowly beaten back by a number of Latin-speaking pagan states.

How plausible would it be that Christianity was widespread enough that Berbers all the way in northwest Africa are following it, but not so widespread that Christians are at best a minority in western Europe?
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