No they were following Catholic doctrine. Christian doctrine includes the New Testament.
Ephesians 2
15 by abolishing in his flesh the law with its commandments and regulations.
Hebrews 8
13 By calling this covenant "new," he has made the first one obsolete; and what is obsolete and aging will soon disappear.
Romans 10
4Christ is the end of the law so that there may be righteousness for everyone who believes.(*)
Romans 7
6But now, by dying to what once bound us, we have been released from the law so that we serve in the new way of the Spirit, and not in the old way of the written code.
2 Corinthians 3
13We are not like Moses, who would put a veil over his face to keep the Israelites from gazing at it while the radiance was fading away. 14But their minds were made dull, for to this day the same veil remains when the old covenant is read. It has not been removed, because only in Christ is it taken away.
Galatians 3 13Christ redeemed us from the curse of the law by becoming a curse for us, for it is written: "Cursed is everyone who is hung on a tree."
23Before this faith came, we were held prisoners by the law, locked up until faith should be revealed. 24So the law was put in charge to lead us to Christ[h] that we might be justified by faith. 25Now that faith has come, we are no longer under the supervision of the law
38 “You have heard that it was said, ‘Eye for eye, and tooth for tooth(Old Testament).’[a] 39 But I tell you, do not resist an evil person. If anyone slaps you on the right cheek, turn to them the other cheek also.
43 “You have heard that it was said, ‘Love your neighbor and hate your enemy.’(Old Testament) 44 But I tell you, love your enemies and pray for those who persecute you, ......