God chose Israel to be a light to the nations.
Which light? A lesser light, or the greater light.
If the Torah is not meant for the nations, ultimately, Israel is both worthless and pointless from the view of the nations, "no need and no care".
If Torah does not include all the promises made in Abraham, those promises become worthless to the nations.
Thus Israel was called as a servant, to bring forth the glory of God to the nations and that glory is seen in both the Messiah and God's righteous law. (Deut 4 - the nations would see and convert to God). The fact that God allowed gentiles to stand at the mountain and receive Torah with Israel, also proves it was not exclusive to Israel, if so, those gentiles should have been kicked out. Very simple logic.
It does appear that an excelling glory can make the lesser glory seem as no glory at all.
2Co 3:10 For even that which was made glorious
had no glory in this respect, by reason of the glory that excelleth.
I think we see an example of this idea here...
Nu 16:3 And they gathered themselves together against Moses and against Aaron, and said unto them, Ye take too much <07227> upon you, seeing all the congregation are holy, every one of them, and the LORD is among them: wherefore then lift ye up yourselves above the congregation of the LORD?
Num 16:9
Seemeth it but a small thing unto you, that the God of Israel hath separated you from the congregation of Israel, to bring you near to himself to do the service of the tabernacle of the LORD, and to stand before the congregation to minister unto them?
Nu 16:10 And he hath brought thee near to him, and all thy brethren the sons of Levi with thee: and
seek ye the priesthood also?
There is no personal relationship with God in a Noachide covenant, at least nothing that we see promised in the Messiah and the blessings of the New Covenant. The reality of God's revelation since then, is so much greater, that everything before it, pales in comparison.
I believe a closer look at Apostolic teaching on God fearing Gentiles, is in order here. Rabbinic teaching does not always teach correct things.
Isa 54:9 For
this is as the waters of Noah unto me: for as I have sworn that the waters of Noah should no more go over the earth; so have I sworn that I would not be wroth with thee, nor rebuke thee.
Eze 14:14 Though these three men,
Noah, Daniel, and Job, were in it, they
should deliver but their own souls by their righteousness, saith the Lord GOD.Eze 14:20 Though
Noah, Daniel, and Job, were in it, as I live, saith the Lord GOD, they shall deliver neither son nor daughter; they shall but
deliver their own souls by their righteousness.
1Pe 3:20 Which sometime were disobedient, when once the longsuffering of God waited in the days of Noah, while the ark was a preparing, wherein few, that is,
eight souls were saved by water.
2Pe 2:5 And spared not the old world, but
saved Noah the eighth person, a
preacher of righteousness, bringing in the flood upon the world of the ungodly;
Noah is listed along with Abraham....... as one which DIED IN FAITH
Heb 11:7 By faith Noah, being warned of God of things not seen as yet,
moved with fear, prepared an ark to the saving of his house; by the which he condemned the world, and
became heir of the righteousness which is by faith.
Noah is
AN HEIR included here along with Able, Abraham, Isaac etc....
13
These all died in faith, not having received the promises, but having
seen them afar off, and were persuaded of them, and embraced them, and confessed that they were strangers and pilgrims on the earth.
14 For they that say such things declare plainly that they seek a country.
15 And truly, if they had been mindful of that country from whence they came out, they might have had opportunity to have returned.
16 But
now they desire a better country, that is, an heavenly: wherefore God is not ashamed to be called their God: for he hath prepared for them a city.
Apostolic Christian teaching (aka Messianic judaism) includes God fearing sons of Noah.