The form of Christianity based on Greek heritage practiced in the Byzantine Empire is Eastern Orthodox.
orthodox Christianity
Christianity
Islam became a rival of Christianity in the Byzantine Empire.
Orthodox Christianity.
It was Orthodox Christianity.
orthodox Christianity
Christianity
Christianity
Islam became a rival of Christianity in the Byzantine Empire.
Orthodox Christianity.
It was Orthodox Christianity.
Islam became the strongest rival of Christianity in the Byzantine Empire.
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It changed it by changing it.
icons
Orthodox Christianity
The state religion of the Byzantine Empire, during the entire time we refer to it by that name, was Christianity.