Greece is a Christian country and 97% of its population practice Orthodox Christianity. The rest, scarce, are Muslim, Roman Catholic and Jewish. Along with Russia, Greece and its islands are the only nations that have so many people professing this branch of Christianity which is in turn the third most important after Catholicism and Protestantism.
According to history, the first Christian who came here to preach was Saint Paul in AD 49, but in reality the true founder of the Orthodox Church was the emperor. Constantine the Great upon converting to Christianity in the XNUMXth century after having the vision of the Cross. Towards the XNUMXth century the Pope of Rome and the Patriarch of Constantinople began to discuss certain points of religion and thus the main differences are the following: the celibacy of their clergy (the Orthodox can marry before being ordained), for the Orthodox the Spirit Holy comes from the Father only and for Catholics also from the Son and things like that.
Such and other spiritual differences and we suppose that politics became more and more important until it occurred. the schism in 1054 when the Pope and the Patriarch were excommunicated respectively. Today is funny, but in those years… God help me! Each church then went its own way.