What was the Success in the diffusion of the Greek Orthodox Church was largely due to?

The success of the diffusion of the Greek Orthodox Church was largely due to its integration with local cultures and political structures, particularly during the Byzantine Empire's expansion. The church's establishment of a hierarchical system of governance and its promotion of education and literacy in the vernacular helped to root it deeply in various communities. Additionally, the church's ability to adapt to local customs while maintaining core doctrines facilitated its acceptance across diverse regions. The support from political leaders also played a crucial role in its spread and influence.