“A Light to the Nations”, also known as “or la'goyim” (אור לגויים), is a term originating from the prophet Isaiah which may express the universal designation of God's kingdom of priests as a mentor for spiritual and moral guidance for the entire world.
The idea itself arises in Adam's mission to tend and keep the Garden of Eden; and in the contrast between Noah and Abraham. (video: Contrasting Noah and Abraham for Noachides).
Israel is a light to the nations, as stated by God:
6 he says, “It is too light a thing that you should be my servant to raise up the tribes of Jacob and to restore the survivors of Israel; I will give you as a light to the nations, that my salvation may reach to the end of the earth.”
7 Thus says the Lord, the Redeemer of Israel and his Holy One, to one deeply despised, abhorred by the nations, the slave of rulers, “Kings shall see and stand up, princes, and they shall prostrate themselves, because of the Lord, who is faithful, the Holy One of Israel, who has chosen you.”Isaiah 49:6-7
Continuing in the theme that God wants everyone to follow his commandments. In the bible, God states the Jews are a light to the nations and that in the end times the world will come to knowledge of God from the Jews.
Isaiah especially mentions this, but so do others; Israel is said by God to be given as a light to the nations.
all the nations shall stream to it. 3 Many peoples shall come and say, “Come, let us go up to the mountain of the Lord, to the house of the God of Jacob; that he may teach us his ways and that we may walk in his paths.” For out of Zion shall go forth instruction, and the word of the Lord from Jerusalem.Isaiah 2:3
6 I am the Lord, I have called you in righteousness, I have taken you by the hand and kept you; I have given you as a covenant to the people,[a] a light to the nations,
7 to open the eyes that are blind, to bring out the prisoners from the dungeon, from the prison those who sit in darkness.
8 I am the Lord, that is my name; my glory I give to no other, nor my praise to idols.
9 See, the former things have come to pass, and new things I now declare; before they spring forth, I tell you of them.Isaiah 42:6-9
And in 60,
So on and so forth,
3 Nations shall come to your light, and kings to the brightness of your dawn.Isaiah 60:3
In the Messianic prophecy of Zechariah, God states the Jews will be the vehicle through which the gentile nations come to God – not Jesus.
20 Thus says the Lord of hosts: Peoples shall yet come, the inhabitants of many cities; 21 the inhabitants of one city shall go to another, saying, “Come, let us go to entreat the favor of the Lord, and to seek the Lord of hosts; I myself am going.” 22 Many peoples and strong nations shall come to seek the Lord of hosts in Jerusalem, and to entreat the favor of the Lord. 23 Thus says the Lord of hosts: In those days ten men from nations of every language shall take hold of a Jew, grasping his garment and saying, “Let us go with you, for we have heard that God is with you.”Zechariah 8:23
Thus we may conclusively state that it is God's will for us to follow his commandments versus believe in any sort of messiah.