The law is the ministration of death
That is precisely what Paul reveals by the Holy Spirit. When a sinner reads the Ten Commandments, he or she is convicted of breaking at least one of those commandments (which we all have broken), and the "wages of sin is death" (Rom 6:23). But Christ nailed all the sin and the guilt of every sinner to the Cross, by becoming Sin for us (hence the allusion to the Brazen Serpent in John 3:14), so that we might be made the righteousness of God in Him (2 Cor 5:21).
What many Christians forget, is that after Christ purchased our redemption with His own Blood, He brought in the New Covenant, and set aside -- indeed abolished -- the Old Covenant as it pertains to Israel. The Ten Commandments are now the Law of Christ (two commandments which can be distilled into one commandment -
Agape Love), or the Perfect Law of Liberty (Rom 10:4; Gal 6:2; Jas 2:12). The letter to the Hebrews makes it plain and clear that there is no more returning to Moses, and those who do so are disobedient to God (Heb 10:26-31). The whole point of Hebrews is that many Jewish Christians wanted to cling to Moses rather than to Christ.
Paul makes it crystal clear that there is no going back to Moses.
At the same time, Gentile Christians (which includes us today) were given four commandments from the Law of Moses (which are not grievous) which are also necessary to fulfil the Law of Christ (Acts 15:19,21). In the apostolic churches the Judaizing Christians wanted to make the observance of the Torah necessary for salvation, but the Holy Spirit overruled, and the Apostles, and Elders, and Brethren of the church at Jerusalem ensured that Moses would not burden the Church of God (Acts 15:28,29
"no greater burden than these necessary things").
If indeed Messianic Jews wish to be Torah observant then they had better ensure that all the sacrifices and all the other requirements of the Law are practised 100% (which was not even possible for Peter and the apostles). God does not say He will accept a partial observance of the Law. It is all or nothing, and one failure makes one guilty of breaking the entire Law (Jas 2:10). Since the Temple and the levitical priesthood are non-existent, that in itself proves that the Old Covenant cannot be maintained now. During the crucifixion, the veil in the Temple was torn in two, and the Temple was utterly destroyed in 70 AD, to teach Israel that the true Temple is now in Heaven (Heb 9:24) and every believer has direct access to the Throne of Grace, made possible by the sinless blood of the Lamb of God (Heb 9:12)..