The error is not understanding the order of things. Belief, Repentence, and Obedience. Salvation comes by Belief, Belief brings repentance from law breaking, and then love brings us to obedience of the commandments. The new covenant is what the Word says: YHWH writes his Laws in our hearts and on our minds, so that we obey in Spirit and Truth. When Jesus comes back, He enforces Torah, those Laws He handed Moses, and brings His Holy Days. Why is it hard for theologians to read the black and white Word and not believe it? Ezekiel 44-48 lays out the return of animal sacrifice and levitical priests from Zadok's lineage. Man does not live by theologians and Catechisms and bread alone, Man lives by every Word that proceeds from the mouth of YHWH. The laws stand until the consumption of the heavens and the Earth. That is why so many believers are realizing that the faith delivered to the Saints has been bastardized by manmade religious doctrines since the days of Messianic believers being kicked out of the assemblies and synagogues in the 200 and 300 A.D.s God is restoring the gentiles and Hebrews into one olive tree rooted in the Messiah. Don't mock believers who take Christ's instructions to Moses seriously. Christ gave them, face to face, to Moses, after all. And not YHWH nor Christ change. We are to change. Below are pertinent passages to study and pray over.
Eze 11:19 -20: “Then I will give them one heart, and I will put a new spirit within them,[fn] and take the stony heart out of their flesh, and give them a heart of flesh, “that they may walk in My statutes and keep My judgments and do them; and they shall be My people, and I will be their God.
Jer 31:33-34 “But this is the covenant that I will make with the house of Israel after those days, says the LORD: I will put My law in their minds, and write it on their hearts; and I will be their God, and they shall be My people. “No more shall every man teach his neighbor, and every man his brother, saying, ‘Know the LORD,’ for they all shall know Me, from the least of them to the greatest of them, says the LORD. For I will forgive their iniquity, and their sin I will remember no more.”
Zec 14:16 - And it shall come to pass that everyone who is left of all the nations which came against Jerusalem shall go up from year to year to worship the King, the LORD of hosts, and to keep the Feast of Tabernacles.
Isa 66:23 - And it shall come to pass That from one New Moon to another, And from one Sabbath to another, All flesh shall come to worship before Me,” says the LORD.
Pro 7:2 - Keep my commands and live, And my law as the apple of your eye. Mat 19:17 - So He said to him, “Why do you call Me good?[fn] No one is good but One, that is, God.[fn] But if you want to enter into life, keep the commandments.”
