Yes, they are.
If sabbath keeping is an imperative to salvation, why aren't circumcision and dietary rules ?
Why keep a sabbath if you are not an OT Jew ?
That would just be a derail from the importance, or unimportance, of sabbath keeping for salvation.
No, he doesn't.
Those things are all things of the "flesh".
"Flesh" that has been crucified with Christ.
Nobody walking in the Spirit would ever do any of that list.
They are obeying the Spirit within them, and not a Law for the Israelites.
If we think according to the Spirt of God within us, we can realize that righteousness is not of the Law.
Does sabbath keeping make anyone holy ?
The Sabbath is written in stone as were the rest of the 10. The other two were not part of the ten.
I keep the Sabbath because the Bible instructs us to do so. Paul makes it pretty clear in his writings as to the difference between Jew and Gentile.
Romans 10: 11 I say then, Have they stumbled that they should fall? God forbid: but rather through their fall salvation is come unto the Gentiles, for to provoke them to jealousy.
12 Now if the fall of them be the riches of the world, and the diminishing of them the riches of the Gentiles; how much more their fulness?
13 For I speak to you Gentiles, inasmuch as I am the apostle of the Gentiles, I magnify mine office:
14 If by any means I may provoke to emulation them which are my flesh, and might save some of them.
15 For if the casting away of them be the reconciling of the world, what shall the receiving of them be, but life from the dead?
16 For if the firstfruit be holy, the lump is also holy: and if the root be holy, so are the branches.
17 And if some of the branches be broken off, and thou, being a wild olive tree, wert graffed in among them, and with them partakest of the root and fatness of the olive tree;
18 Boast not against the branches. But if thou boast, thou bearest not the root, but the root thee.
19 Thou wilt say then, The branches were broken off, that I might be graffed in.
20 Well; because of unbelief they were broken off, and thou standest by faith. Be not highminded, but fear:
21 For if God spared not the natural branches, take heed lest he also spare not thee.
Romans 2: 28 For he is not a Jew, which is one outwardly; neither is that circumcision, which is outward in the flesh:
29
But he is a Jew, which is one inwardly; and circumcision is that of the heart, in the spirit, and not in the letter; whose praise is not of men, but of God.
Romans 10: 11 For the scripture saith, Whosoever believeth on him shall not be ashamed.
12
For there is no difference between the Jew and the Greek: for the same Lord over all is rich unto all that call upon him.
13 For whosoever shall call upon the name of the Lord shall be saved.
Galatians 1: 27 For as many of you as have been baptized into Christ have put on Christ.
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There is neither Jew nor Greek, there is neither bond nor free, there is neither male nor female: for ye are all one in Christ Jesus.
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And if ye be Christ’s, then are ye Abraham’s seed, and heirs according to the promise.
Colossians 3: 11
Where there is neither Greek nor Jew, circumcision nor uncircumcision, Barbarian, Scythian, bond nor free: but Christ is all, and in all.
So What does Paul say the difference is between Jew and Gentile? He says there is no difference. Zip. Nada. None. Zero.
The only difference is in the minds of those who have been taught there is by dishonest people.