Well, the Orthodox Church is indeed national and does not answer to one central authority (apart from, you know,
that guy 
), but going by the
Cambridge English dictionary, calling it different denominations is incorrect.
Quote:
denomination (RELIGIOUS GROUP)
group noun [C]
a religious group which has slightly different beliefs from other groups which share the same religion:
Protestantism and Roman Catholicism are both denominations of the Christian faith.
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Seeing as there is an unreformed and unreformable common ground for the national churches, the division between them is merely political, not theological.