The Byzantine empire took on Christianity because of their different opinions in worship icons. This resulted in importance of church in state & don't forget that the cross is different in the orthodox Christianity religion than in the roman catholic religion.
orthodox Christianity
Christianity
Christianity
Islam became a rival of Christianity in the Byzantine Empire.
It was Orthodox Christianity.
Orthodox Christianity.
Islam became the strongest rival of Christianity in the Byzantine Empire.
The form of Christianity based on Greek heritage practiced in the Byzantine Empire is Eastern Orthodox.
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icons
It changed it by changing it.
Orthodox Christianity