One year before he refused to sacrifice to the idols, in 325 A.D., Saint Constantine attended the sessions of the First Ecumenical Council, where the Church Fathers recited the Trisagion (“Thrice Holy”) hymn ‒ “Holy God, Holy Mighty, Holy Immortal…” – as an Orthodox doctrine.
It was the most crucial point in my opinion, which is also the opinion of historians who study these issues. Constantine did not sacrifice to the Caesar, in other words to himself, because he acknowledged that there is no other “Caesar” on earth but God. Not surprisingly, Zosimus seized the opportunity to interpret this fact as evidence of Constantine’s hatred and enmity towards all Romans. In his eyes he was sacrilegious, an enemy of justice, a foul villain. All because he had rejected a tradition. A tradition, you know, has real value only if it carries true meaning. Our salvation does not rest on an arbitrary notion of “tradition”. We, as Orthodox Christians, speak of Tradition in the name of the Holy Spirit. A tradition that is devoid of the Holy Spirit makes no sense. What good is it, if it just serves the perpetuation of certain habits or the preservation of mores and customs? What significance does it have, especially if it happens to be a demonic tradition [as in the aforementioned case]? This is something that Zosimus could never understand. Read more here: Saint Constantine