Wow. I already explained the background to the Biblical use of the term "people" Did you not understand? Are you reading the passage of scripture I give to you?
Look at the following passage.
Deuteronomy 7:1-6
When the Lord your God brings you into the land where you are entering to possess it, and clears away many nations before you, the Hittites and the Girgashites and the Amorites and the Canaanites and the Perizzites and the Hivites and the Jebusites, seven nations greater and stronger than you, and when the Lord your God delivers them before you and you defeat them, then you shall utterly destroy them. You shall make no covenant with them and show no favor to them. Furthermore, you shall not intermarry with them; you shall not give your daughters to their sons, nor shall you take their daughters for your sons. For they will turn your sons away from following Me to serve other gods; then the anger of the Lord will be kindled against you and He will quickly destroy you. But thus you shall do to them: you shall tear down their altars, and smash their sacred pillars, and hew down their Asherim, and burn their graven images with fire. For you are a holy people to the Lord your God; the Lord your God has chosen you to be a people for His own possession out of all the peoples who are on the face of the earth.
Did you catch that? Who are NOT the people of God?
Hittites and the Girgashites and the Amorites and the Canaanites and the Perizzites and the Hivites and the Jebusites,
The Lord speaks to the 12 tribes assembled at Mt. Sinai to declare, "
Lord your God has chosen you to be a people for His own possession out of all the peoples who are on the face of the earth."
God has chosen the 12 Tribes from among all the other peoples on the earth. The Hittites are not his people; the Girgashites are not his people; The Amorites are not his people. And so on. There are NO Gentiles that are his "people."
Are we his children? Yes. Are we people? Yes. But that is not what the Lord means when he says, "You are my people." In order to understand the Lord, we need to bear in mind the covenant he made at Mt. Sinai. He promised to be "god" to them. What does that mean?
Consider the Blessings and the Cursings as recorded in Deuteronomy 11.
Deuteronomy 11:26-28
See, I am setting before you today a blessing and a curse: the blessing, if you listen to the commandments of the Lord your God, which I am commanding you today; and the curse, if you do not listen to the commandments of the Lord your God, but turn aside from the way which I am commanding you today, by following other gods which you have not known.
As far as I know, The Lord made no such agreement with any other nation. He didn't set blessing and curses before US citizens, Russians, Chinese, Japanese, Italians, Spanish, or any other nation on earth. That agreement was between God, the people who were present there, and future generations after them. Deuteronomy 29.