If you are under the new covenant you are certainly a child of Israel Terry. That is who the new covenant is with:
Jer 31:31 Behold, the days come, saith the LORD, that I will make a new covenant with the house of Israel, and with the house of Judah:
Heb 8:8 For finding fault with them, he saith, Behold, the days come, saith the Lord, when I will make a new covenant with the house of Israel and with the house of Judah:
Both the old testament and the new testament state this explicitly. Do you agree with it?
All references of God addressing the "children of Israel" in the OT are exclusively to the Hebrews. And since the NT replaces the Old, what was passed on to the Jews is not binding for the Gentiles. We are not required to follow Hebrew customs, works of the law, feats and sacrifices. But, as Paul says, "those under the law" must.
That Doug was the problem addressed in Acts 15, and Galations Doug.
Deu 7:6 For thou [art] an holy people unto the LORD thy God: the LORD thy God hath chosen thee to be a special people unto himself, above all people that [are] upon the face of the earth.
Deu 7:7 The LORD did not set his love upon you, nor choose you, because ye were more in number than any people; for ye [were] the fewest of all people:
Deu 7:8 But because the LORD loved you, and because he would keep the oath which he had sworn unto your fathers, hath the LORD brought you out with a mighty hand, and redeemed you out of the house of bondmen, from the hand of Pharaoh king of Egypt.
God never considered the gentile nations a part of Israel in the OT.
Heb 8:8 For finding fault with them, he saith, Behold, the days come, saith the Lord, when I will make a new covenant with the house of Israel and with the house of Judah:
And who was the book of HEBREWS written to? This is a teaching to the Jewish Christians , this is not about the Gentiles being tied to the Old Covenant laws .
When Moses was told to tell Israel to celebrate the holy days the message was to Israel not Gentiles. Now Hebrews teaches that the New Covenant supersedes the old covenant of levitical laws and mandatory holy days