I agree with everything you say; however, the article seems to at least suggest that Egypt (Alexandria) was THE center of Christendom for a thousand years. This is patently false. Alexandria was certainly ONE of the great Christian cities; however, this lasted for no more than seven centuries.
"Anciently, the fountain of Christian knowledge was Egypt and the Mediterranean region and for about 1,000 years 90 percent of the people were in the faith "until they were converted to Islam by the sword," he said."
"Egypt and the Mediterrnean region" is elastic enough to cover anything the author wants to establish, I guess. I know the Muslims had conquered all of Northern Africa by the early 700's AD, because by 711 they were already crossing over and conquering Spain. Which was entirely under their control within 8 years. And then the Spaniards had to fight a 700 year war to push them back!
Fascinating, terrifying history.
What this has to do with Mormonism is, as far as I can see, zilch.