The faithful in Christ Jesus are the true Church. A body of believers who are called out of this world system into the kingdom of heaven. Colossians 1:12-13
 
Gentiles without Christ are aliens from the commonwealth of Israel; strangers from the covenants of promises , having no hope, and without God.
In Christ Jesus we are fellow heirs of the same covenant promises of Israel.  Ephesians 2:11-18; 3:1-12
 
God's covenant with Israel will last forever.
 
Jeremiah 33:19-21
"And the world of the Lord came unto Jeremiah, saying, "Thus saith the Lord; if you can break my  covenant of the day, and my covenant of the night, and that these should not be day and night in their season. Then may also my covenant be broken with David my servant, that he should not have a son to reign upon his throne; and with the  Levites the priests , my ministers."
 
The strength of God's covenant continues in verses 22-26, and Jeremiah 31:31-37.
 
Who is this son to reign upon the throne of Israel forever?
 
The angel, Gabriel said unto Mary,"you shall conceive and bring forth a son and call him Jesus. He shall be great and shall be called the son of the Highest, and the Lord God shall given unto him the throne of his father David. He shall reign over the house of Jacob forever." And of his Kingdom shall be no end.
Luke 1:30-33
 
God's covenant promises to Israel began with Abraham and will last forever. This is no New Israel.  The truth Church is the body of Christ and are fellow heirs of God's covenant with Israel.
 
Israel will be engraved forever in the heavenly city New Jerusalem. The twelve tribes of the children of Israel are written on the twelve gates of New Jerusalem. The twelve foundations of the wall of the City are the names of the twelve apostles of the lamb.  Rev 21:1-14
 
There is a reason why the true Church is not spoke of after Chapter 3 in the book of Revelation.