Very little is said about many things in Genesis. You refuse to admit the the 7th day Sabbath goes back to creation not Noah or Abraham. It was in existence before the Law which means that it is higher than the carnal commandments which have been abolished. Marriage and the Sabbath were instituted in Eden. Do non-Jews get married today?
No need to speculate and guess. Following are the relevant laws and their application as given orally by Moses, and enforced with vigor by Jewish courts, up to and including the Sanhedrin. Not only does the Sabbath NOT go back to creation, but Gentiles who tried keeping it were subject to the Death Penalty:
Chapter 9.
9.1 Adam, the first man, was commanded with six commandments: 1) idolatry, 2) “blessing” (euphemistically) the Name (of G-d), 3) murder, 4) illicit sexual relations, 5) thievery and, 6) establishing a system of justice.
9.2 Even though all of these have been received as a Tradition from Moses our Teacher and we can understand the rationale for them, nevertheless, from(verses in) the Torah (we learn that) it was these that they were commanded. A seventh commandment forbidding the eating of a limb torn from a live animal was added for Noah, as it says, “Even flesh, life is in the blood, do not eat of it” (Genesis 9:4).
9.3 These commandments were universally applicable - until Abraham. With Abraham, circumcision was also commanded and he prayed Shacharis (the Morning Prayer). Isaac separated out a tithe and added another prayer in the afternoon and, with Jacob, the prohibition against eating the sciatic nerve was added, as was the Maariv (Evening) Prayer. In Egypt, Amram was commanded with other precepts81F82 and, with Moses our Teacher, the Torah was completed.
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10.11 A non-Jew who busied himself with Torah is liable with his life. He must involve himself in their Seven Commandments only. Similarly, a non-Jew who “rested” as one would on Shabbos, even on a weekday, is liable with the death penalty. There is no reason to mention (that he is culpable) if he invented his own holiday.
10.12 The principle here is that we do not permit them to make a new religion and create new commandments for themselves based on their own reasoning. They may only become Righteous Converts and accept upon themselves all the Commandments, or they must observe their own (Seven) Laws only, and not add or detract from them. If a non-Jew busied himself with Torah or made Shabbos or made up something new, we give him lashes and punish him and tell him that he is liable with the death penalty for doing this. But he is not executed.
http://halakhah.com/rst/kingsandwars.pdf
It's good that God did not leave the Patriarchs to guess about the Law they were under. Here's Edersheim's version of the Noahide commandments, which were deliberately left out of
Patriarchs and Prophets while Ellen White was plagiarizing whole chapters out of Edersheim's Old Testament:
"Perhaps we ought also to notice in this connection that, whatever may have been the common practice before, now for the first time the use of animal food was expressly permitted, with the exception of the blood, and that probably for the reason afterwards mentioned in the case of sacrifices, that the blood was the seat of life. (Leviticus 17:11, 14) Another and most important change is marked by the solemn prohibition of murder, with this addition, that "whoso sheddeth man's blood, by man shall his blood be shed." Such crimes were no longer to be avenged directly by God Himself, but He delegated His authority to man. (Romans 8:1, 2) As Luther rightly says, "In these words the civil magistracy is instituted, and the Divine right of bearing the sword." For when it is added, as a reason why murder should be punished with death, that God made man in His own image, it seems to convey that vengeance might not be taken by any one at his own will, but that this belonged to those who on earth represented the authority of God, or were His delegates; whence also they are called in Psalm 82:6, "gods," or rather "Elohim."* And, as Luther rightly argues, "If God concedes to man the power over life and death, assuredly this carries with it authority over that which is less than life, such as goods, family, wife, children, servants, and land." Thus the words spoken by the Lord to Noah contain the warrant and authority of those who are appointed rulers and judges over us. In later times the Jews have been wont to speak of what they called the seven Noachic commandments, which, according to them, were binding upon all Gentile proselytes. These were a prohibition (1) of idolatry, (2) of blasphemy, (3) of murder,
(4) of incest, (5) of robbery and theft, (6) of eating blood and strangled animals, and (7) an injunction of obedience to magistrates. (Comp. also Acts 15:20)."
Chapter 7
And here is how the Sanhedrin viewed its duty to enforce the Noahide Commandments in areas under its jurisdiction:
"Having established that the Noachide commandments are binding on Gentiles, and that lack of knowledge does not excuse obligation, it is necessary to explore what the commandments are. The talmud[28] recounts seven categories of prohibition: idol worship, taking God's name in vain, murder, prohibited sexual activity, theft, eating flesh from a living animal, and the obligation to enforce laws. As is obvious from this list, these seven commandments are generalities which contain within them many specifications -- thus, for example, the single categorical prohibition of sexual promiscuity includes both adultery and the various forms of incest.[29] As has been noted already, these Noachide laws appear to encompass nearly 60 of the 613 biblical commandments incumbent on Jews, which is nearly one in four of those biblical commandments generally applicable in post-temple times."
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"However, disputes about the details should not be overstated to undermine the clarity of the general principles. The application of Noachide law to many general areas is relatively clear. Homosexuality is forbidden,[37] as is adultery[38] and bestiality.[39] Murder is prohibited, and subsumed in the prohibition of murder is abortion.[40] So too, most forms of theft are prohibited, as is eating the flesh of a living animal.[41] Indeed, the general Noachide laws share a common base of "ethics" that most religious peoples would share."
http://www.jlaw.com/Articles/noach2.html#noachide
The history is absolutely solid: NONE of the Patriarchs prior to Moses were given the Sabbath.
