I will not answer your question, since I am unfit to do it, but I will rather comment on something.
In about 1700 AD there was only 60 000 orthodox in Greece left, but it was enough to keep the continouing of the faith and God sent the two saints Kosmas F and Kosma entolos , how helped to create an entire nation of this 60 000 that where left.
Greece did not just stop being Orthodox for a few centuries, then become Orthodox again thanks to two Saints: Greece was Orthodox all the way round. During the Turkocracy, being a christian was not easy, so many were hiding. It was not just the Orthodox and the Muslims, it was the large population of the Orthodox and the small but ruling population of Muslims.
Saints Kosmas certainly did do a work equal to an apostle's, but he did not start out of the zero. He helped the Christians realise the magnitude of the Orthodox faith, not teach them Orthodoxy from the start.
And generally, 60 000 may seem small as a number now, but back then it wasn't.
Back that time it would have been easier to declare yourself a Turk and spare yourself and your children from a lot of trouble, that's why the Orthodox were considered a minority. So was the "kryptoxriastianoi" first used in Turkocracy.