According to history, those few Christian ministers who traveled to Nicea, left before it started, when they were not able to persuade the followers of the heretics Athanasius and Arius, to repent and return to the Word. It was the Word Which bled and died for Me on Calvary, not a Roman creed. If God were known by learning the dead letter of the written Word, the wealthy and well-educated would have a monopoly on the Kingdom. To start with, sin is not smoking, drinking, adultery, murder, lying, theft, etc., any more than faith is love, joy, goodness, kindness, etc. People lie, cheat and steal because they are sinners.
Sin is one thing and one thing only.
Sin is unbelief in the revealed Word of God. Its possible to follow the letter of the Bible and be lost in sin, or unbelief in the revealed Word today, as it was in Israel. God's Word is a stumbling stone, condemning the religious who are not spiritual, as it condemns outright unbelievers. The carnal mind is enmity with God. Caiaphas and the ministers of his day, crucified the very God they claimed to serve.