It is a matter of speculation as to what today’s Orthodox Church would have looked like, had secularism not been spread from the West by the uprooted aristocracy and intelligentsia. Having abandoned Orthodox civilizational values, that is, lost the Christian Faith, they used this alien secularism to justify their overthrow of the Russian Empire in 1917. This disaster left the smaller and weaker Local Churches Emperorless and in disarray, victims of a foreign calendar and political interference, and unable to conduct missionary work.
The division of the Church into today’s fourteen mainly national Local Churches, many very small, seems unlikely. Surely Church structures would have become denationalized and so far bigger, possibly with one billion Orthodox, perhaps in Five Patriarchates. These would have taken turns to govern Mt Athos, which would have become far bigger and the true international monastic centre of the Church, where ten-yearly administrative Patriarchal Councils could have been held. The Five Patriarchates might have been:
Patriarchate of Rus (in Moscow, 750 million?), covering the Russian Empire, with the Autocephalous Catholicosate of Georgia, plus Ten Autonomous Churches, some of which, with several million members, would by now be close to Autocephaly and Patriarchal status. With five in Asia and five in Europe and its Diasporas, these would cover: China and Tibet; Korea; Japan; the Isles of Asia (Malaysia, Indonesia and the Philippines); South East Asia (Burma, Thailand, Laos, Cambodia, Vietnam); Europe (covering independent Poland, Lithuania, Latvia, Estonia, Finland, as well as the Czech Lands, Slovakia, Hungary and the sixteen ex-Catholic and ex-Protestant countries in Western Europe); the 13 countries of South America; Mexico, the seven countries of Central America and the Caribbean; Anglo-America with Alaska and Greenland; Australasia.
Patriarchate of Alexandria (in Nairobi, 120 million?): All Africa.
Patriarchate of Antioch (in New Delhi, 60 million?): Covering the Asian Arab World, Iran, Afghanistan and the Indian Subcontinent.
Patriarchate of Constantinople (in Bucharest, Athens, Belgrade, Sofia and Nicosia, 50 million?), made up of the Five Autocephalous Balkan Union Churches, the nationality of the Patriarch alternating, covering: Greece, with two Autonomous Metropolias for Albania and Turkey; Romania; Serbia, with four Autonomous Metropolias for Macedonia, Montenegro, Bosnia and Croatia/Slovenia; Bulgaria; Cyprus.
Patriarchate of Jerusalem (5 million?): Covering Palestine on both sides of the Jordan and the Holy Places.