I am not Jew Fallacy

Numbers 15:13-16 ASV
(13) All that are home-born shall do these things after this manner, in offering an offering made by fire, of a sweet savor unto Jehovah.
(14) And if a stranger sojourn with you, or whosoever may be among you throughout your generations, and will offer an offering made by fire, of a sweet savor unto Jehovah; as ye do, so he shall do.
(15) For the assembly, there shall be one statute for you, and for the stranger that sojourneth with you, a statute for ever throughout your generations: as ye are, so shall the sojourner be before Jehovah.
(16) One law and one ordinance shall be for you, and for the stranger that sojourneth with you.

Jesus merged the whole world under Him by adding all the pagans of the world: we became all Jews or all Pagans.

There is no Jew nor Greek; there is no bondman nor freeman; there is no male and female; for ye are all one in Christ Jesus: Galatians 3:28 Darby

We are not Jews by race because the world rejects God (Jesus) from the beginning. Nevertheless, From Antiquity till the end of the world, eSHABBAT has been for all willing men, according to Isaiah 56:1-8, that is, Jews and all Pagans. We understand in the aforementioned Isaiah passage that God did not exempt any converted Pagan from doing His will in any thing. In the passage, we cannot imagine a pagan convert in Antiquity bragging "Oh! No! I don't do Shabbat! I am not Jew!" Or anything else.

From the point of view of Isaiah 56 and Numbers 15:15-16, there had never been a difference between the Jews and the Pagans, except that the Pagans turn their back to God (Jesus) as the chosen people also did and that God (Jesus) would not force them to comply with His will.

Numbers 15:13-16 ASV
(13) All that are home-born shall do these things after this manner, in offering an offering made by fire, of a sweet savor unto Jehovah.
(14) And if a stranger sojourn with you, or whosoever may be among you throughout your generations, and will offer an offering made by fire, of a sweet savor unto Jehovah; as ye do, so he shall do.
(15) For the assembly, there shall be one statute for you, and for the stranger that sojourneth with you, a statute for ever throughout your generations: as ye are, so shall the sojourner be before Jehovah.
(16) One law and one ordinance shall be for you, and for the stranger that sojourneth with you.

So, it is foolishness that a converted to Christianity can elect to reject any doctrine in the Law and the Prophets because the person is not a Jew.

Are Christians unique in their refusal to keep the sabbath Day? No! The Israelites got exiled because they did not want to keep the sabbath Day, among other rebellions! (Jeremiah 17:19-27)

Jeremiah 17:19-27 ASV
(19) Thus said Jehovah unto me: Go, and stand in the gate of the children of the people, whereby the kings of Judah come in, and by which they go out, and in all the gates of Jerusalem;
(20) and say unto them, Hear ye the word of Jehovah, ye kings of Judah, and all Judah, and all the inhabitants of Jerusalem, that enter in by these gates:
(21) Thus saith Jehovah, Take heed to yourselves, and bear no burden on the sabbath day, nor bring it in by the gates of Jerusalem;
(22) neither carry forth a burden out of your houses on the sabbath day, neither do ye any work: but hallow ye the sabbath day, as I commanded your fathers.
(23) But they hearkened not, neither inclined their ear, but made their neck stiff, that they might not hear, and might not receive instruction.
(24) And it shall come to pass, if ye diligently hearken unto me, saith Jehovah, to bring in no burden through the gates of this city on the sabbath day, but to hallow the sabbath day, to do no work therein;
(25) then shall there enter in by the gates of this city kings and princes sitting upon the throne of David, riding in chariots and on horses, they, and their princes, the men of Judah, and the inhabitants of Jerusalem; and this city shall remain for ever.
(26) And they shall come from the cities of Judah, and from the places round about Jerusalem, and from the land of Benjamin, and from the lowland, and from the hill-country, and from the South, bringing burnt-offerings, and sacrifices, and meal-offerings, and frankincense, and bringing sacrifices of thanksgiving, unto the house of Jehovah.
(27) But if ye will not hearken unto me to hallow the sabbath day, and not to bear a burden and enter in at the gates of Jerusalem on the sabbath day; then will I kindle a fire in the gates thereof, and it shall devour the palaces of Jerusalem, and it shall not be quenched.

Did either Jesus or the Pharisees want the abolition of the Sabbath Day? Not at all! They disagree on how to keep the sabbath holy! Jesus is the Jehovah (LORD) of the sabbath.

Matthew 12:8 ASV
For the Son of man is lord of the sabbath.
Mark 2:28 ASV
so that the Son of man is lord even of the sabbath.
Luke 6:5 ASV
And he said unto them, The Son of man is lord of the sabbath.
Luke 13:15 ASV
But the Lord answered him, and said, Ye hypocrites, doth not each one of you on the sabbath loose his ox or his ass from the stall, and lead him away to watering?

Isaiah 58:13-14 ASV
(13) If thou turn away thy foot from the sabbath, from doing thy pleasure on my holy day; and call the sabbath a delight, and the holy of Jehovah honorable; and shalt honor it, not doing thine own ways, nor finding thine own pleasure, nor speaking thine own words:
(14) then shalt thou delight thyself in Jehovah; and I will make thee to ride upon the high places of the earth; and I will feed thee with the heritage of Jacob thy father: for the mouth of Jehovah hath spoken it.

REPETITION OF WARNING:
If we are missing just ONE commandment in our belief system, we will not be saved because we are not without sin, that is, we are not holy. The grace of Jesus is for the holy ones, according to Ezekiel 33:13-20.

Ezekiel 33:13 ASV
(13) When I say to the righteous, that he shall surely live; if he trust to his righteousness, and commit iniquity, none of his righteous deeds shall be remembered; but in his iniquity that he hath committed, therein shall he die.
Read also Romans 2:12-13