A very interesting topic.....
A couple of observations.....Is every man born with a Spirit given by God thereby having somewhat of an internal sense of right and wrong?
The Noahide Laws were given to Noah by God for all of his descendents to obey....
From the Jewishencyclopedia.com article concerning the Noahide Law...
LAWS, NOACHIAN:
ARTICLE HEADINGS:
The Seven Laws.
Laws Before Sinai.
Procedure.
Special Exceptions.
The Seven Laws.
Laws which were supposed by the Rabbis to have been binding upon mankind at large even before the revelation at Sinai, and which are still binding upon non-Jews. The term Noachian indicates the universality of these ordinances, since the whole human race was supposed to be descended from the three sons of Noah, who alone survived the Flood. Although only those laws which are found in the earlier chapters of the Pentateuch, before the record of the revelation at Sinai, should, it would seem, be binding upon all mankind, yet the Rabbis discarded some and, by hermeneutic rules or in accordance with some tradition (see Judah ha-Levi, "Cuzari," iii. 73), introduced others which are not found there. Basing their views on the passage in Gen. ii. 16, they declared that the following six commandments were enjoined upon Adam: (1) not to worship idols; (2) not to blaspheme the name of God; (3) to establish courts of justice; (4) not to kill; (5) not to commit adultery; and (6) not to rob (Gen. R. xvi. 9, xxiv. 5; Cant. R. i. 16; comp. Seder 'Olam Rabbah, ed. Ratner, ch. v. and notes, Wilna, 1897; Maimonides, "Yad," Melakim, ix. 1). A seventh commandment was added after the Floodâ€â€not to eat flesh that had been cut from a living animal (Gen. ix. 4). Thus,the Talmud frequently speaks of "the seven laws of the sons of Noah," which were regarded as obligatory upon all mankind, in contradistinction to those that were binding upon Israelites only (Tosef., 'Ab. Zarah, ix. 4; Sanh. 56a et seq.).
While many additions were made to these laws by some of the tannaimâ€â€e.g., the prohibitions against eating the blood of a living animal, against the emasculation of animals, against sorcery, against pairing animals of different species, and against grafting trees of different kinds (ib. 56b)â€â€so that in one place thirty Noachian laws are mentioned (Ḥul. 92a; comp. Yer. 'Ab. Zarah ii. 1), the prevalent opinion in the Talmud is that there are only seven laws which are binding upon all mankind. In another baraita (Tanna debe Menasseh) the seven Noachian prohibitions are enumerated as applying to the following: (1) idolatry, (2) adultery, (3) murder, (4) robbery, (5) eating of a limb cut from a living animal, (6) the emasculation of animals, (7) the pairing of animals of different species (Sanh. 56b).
and interesting topic as that Men before Sinai appear to be judged according to these laws.....
Another interesting item concerning the giving of the Law at Sinai...
According to Jewish tradition, the thunderings occurring during the giving of the Law were actually the Law being given in the 70 known languages of that time.
Actually, it was the first Pentecost (Exe 19) and was the predessesor of the Pentecost of Acts where the same thing happened except there were about 120 languages by then.
If....the Law was given to the nations at Sinai (thundering's etc) are gentile men held accountable for not observing them.
Who knows.....or does God judge the hearts of men who do not have a saving knowledge of Christ.