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. Those same spirits are behind the pulpit today, rejecting Him because His Word disagrees with their man-made theology.