The death of Christ, which saves whoever believes in Him, replaced animal sacrifices, not to replace the whole law but the sacrificial law. If the whole law were replaced, there would be no sin because there's nothing to reveal sin. The fact that Paul spoke against sin in Galatians chapter 5 and 6 indicated there's still sin. So go figure.
The Death & Resurrection of Jesus Christ not only replace animal sacrifices , He free Israel & Judah and everyone from
bondage. His fullfillment of following the law complete and going to the cross brought fourth a new covenant, that one no longer had to observe a certain day (sabbath) to worship God or else be sentence to death which was part of the old covenant.
Exodus 31:15 Six days may work be done; but in the seventh is the sabbath of rest, holy to the LORD: whosoever doeth any work in the sabbath day, he shall surely be put to death.
None of the apostles of Jesus Christ taught that the sabbath was to be keep in the new covenant. Show me one verse in the NT that approves the Apostles of Jesus Christ taught the fourth commandment to be keep to all Christians.
Galatians 5:1
For freedom Christ has set us free; stand firm therefore, and do not submit again to a yoke of slavery.
Acts 15:5
The Council at Jerusalem
5But there rose up certain of the sect of the Pharisees which believed, saying,
That it was needful to circumcise them, and to command them to keep the law of Moses.
6And the apostles and elders came together for to consider of this matter.
7And when there had been much disputing, Peter rose up, and said unto them, Men
and brethren, ye know how that a good while ago God made choice among us, that the Gentiles by my mouth should hear the word of the gospel, and believe.
8And God, which knoweth the hearts, bare them witness, giving them the Holy Ghost, even as
he did unto us;
9And put no difference between us and them, purifying their hearts by faith.
10Now therefore why tempt ye God, to put a yoke upon the neck of the disciples, which neither our fathers nor we were able to bear? 11But we believe that through the grace of the Lord Jesus Christ we shall be saved, even as they.
Living by the spirit brother and you don't have to worry about law.
Galation 5:22-23
22 But the fruit of the Spirit is love, joy, peace, longsuffering, gentleness, goodness, faith,
23Meekness, temperance: against such there is no law.
God Bless