The Old Testament ceremonial law is viewed as a bondage from which the Christian gospel of grace as God’s gift frees a person through faith in the New Testament. The classic text is the epistle to the Galatians, written to dissuade Christian converts from succumbing to the attempts of Judaizers to get them to adhere again to the Old Testament ceremonial law as a necessary part of salvation.
“For freedom Christ has set us free,” writes Paul; “stand fast therefore, and do not submit again to a yoke of slavery” (Gal 5:1 RSV). Christ was “born under the law, to redeem those who were under the law” (Gal 4:4–5). To “rely on works of the law” for salvation is to be “under a curse” (3:10). Similarly, to place oneself under the Old Testament ceremonial law is “slavery,” while choosing “the Jerusalem above is free” (Gal 4:24–25 RSV).
Paul specifically rejects “works of Law” for salvation-historical reasons. “Works of Law” are not excluded because they cannot be fulfilled nor because they lead to meritorious works-righteousness. The coming of Jesus marks the turn of an era; the era of separation between Jews and Gentiles has ended.
Paul argued that by parity of reasoning those seeking to return to the ceremonial law would need to keep the whole Mosaic law for salvation; but this would be seeking justification by the law in any event, and such a quest would mean a falling away from grace and from Christ (Gal. 5:2–4).
The Christian, Jew or Gentile, Paul maintained, is free from all need to perform works of law for acceptance, for as a believer in Christ he is fully accepted already (Gal. 3:28f.), as the gift of the Spirit to him proves (Gal. 3:2f., 14; 4:6; 5:18).
As Biblical PhD scholars Packer, Wood, Marshall, Millard, and Wiseman state, There is no reason why a Gentile convert should burden himself with Mosaic ceremonies. The redeeming work of Christ has freed him completely from the need to seek salvation through law (Gal. 3:13; 4:5; 5:1). His task now is, first, to guard his God-given liberty against any who would tell him that faith in Christ alone is not enough to save him (Gal. 5:1) and, second, to put his liberty to the best use by letting the Spirit lead him into responsible fulfillment of the law of love (Gal. 5:13ff.).
Now we strive toward agape love and God's holiness (rooted in his universal morality) rather than the ceremonial tenants of the Mosaic Law... an old covenant God once had with the ancient nation of Israel which Christ fulfilled and that is no longer binding.
Confusing the ceremonial law of the old covenant with God's universal morality is fallacious.
Read:
Is the Sabbath Required for Christians Today? | Grace Communion International