>> Indeed. The real historical record reveals that Christian theology flourished not only in Alexandria (Cyril, Clement) but in Jerusalem (Matthew, James, Cyril), Antioch (Ignatius), Edessa (Ephrem), Asia Minor (Basil, Gregory Of Nyssa, John Chrysostom), Rome (Ambrose, Gregory), Carthage (Augustine, Tertullian), Marseilles (Irenaeus), Seville (Isidore) and many other places besides. <<
Not only that, but Egypt was the home of vast numbers of syncretist Hindus and Zoroastrians who sought to absorb Christianity into their pantheistic religions. Hence, much of what comes from Egypt is non-representative of Christianity. Further, the government of Egypt is very hostile to any research which might validate Jewish and Christian versions of histories, so whatever flows from Egypt tends to be the worst of the worst.
In the ancient world it made sense that ANY religious or philosophical movement would expand from it’s geographical starting point and Christianity was no different, the Apostles went out in all directions to preach the Gospel.