What will be messiahs role for the Gentile nations when he comes? What will be Isreals role towards the Gentile nations in the scheme of things when messiah comes?
If I may,
The messiah (note the small "m," messiah is a title, is hardly unique, and does not indicate nor imply divinity) will be the king of his Nation, much like Elizabeth is the queen of hers. The Constitution of his country will be the Torah. And it will be enforced, at least in Israel.
As the leader of his country, messiah will represent his country before the Nations, just as Bush does for America.
If the Nations are friendly to Israel, Israel will be friendly to the Nations, if not, then the Nations will be crushed by G-d.
The Nations will benefit from the abundance of foodstuffs that Israel will produce in the messianic era. The Nations will benefit Israel monitarily. Possibly the two go together, but I have not been taught that they do.
All Israel will act as priests to the Gentile Nations, as Levi acts as priests to Israel. This is one reason Israel is called "messiah" in certain passages; they will be "anointed" just as Levites are anointed to serve the same office. Remember, "messiah" means, "anointed," and one was anointed to hold one of three offices: priest, prophet and/or king. No one person could possible hold all three offices, because priests are to come from Levi, while the kings come from Judah, and since his days, from Soloman.
But it is possble to be anointed to hold two offices, (priest/prophet, or king/prophet) and some people already have been.
Yes I do insist that the heritage that the Gentile christians claim is really of Jewish origin (disciples of Christ).
You must realize that your insistence carries no weight with me (I can't speak for anyone else), because you don't know the Torah as it is taught by the experts, so you have no foundation to say christianity is related to Judaism. In short, you don't know Judaism well enough to be able to say what is or is not like it. You only know what the christians say Judaism is like, or have at best the slimmest slice of understanding of Judaism based on what you think you understand of what you have heard from Jews themselves.