The lesson of the Torah reading בְּמִדְבַּר Bamidbar (“in the wilderness,” Num. 1:1–4:20) is the family of God started with Abraham, then his son Yitskhak (Isaac), his grandson Ya’akob (Jacob) and Jacob’s 12 sons. From that small family, the knowledge of God has spread all over the world.
It is the job of the Messiah — Yeshua (Jesus) — to find and gather all those who want to be adopted as God’s sons and daughters until He returns again. There will be no Gentiles in the Kingdom of God. All those who come in become part of Israel.