The new covenant is to the houses of Judah and Israel. Not Gentiles or Church.
The new covenant is not in force yet. It is to the physical houses of Israel and Judah.
In the prophecies there is no mention of Gentiles.
Revelations after the rapture has zero mention of Church or Gentiles. But it most assuredly deals with the 12 tribes of Israel (which is very genetic and physical), the temple, Israel and Jerusalem, all physical.
So who was Paul talking to in Galatians 3: 26-29?
26 For you are all sons of God through faith in Christ Jesus.
27 For all of you who were baptized into Christ have clothed yourselves with Christ.
28 There is neither Jew nor Greek, there is neither slave nor free man, there is neither male nor female; for you are all one in … Christ Jesus.
29 And if you be Christ's, then are you Abraham's seed, and heirs according to the Promise.
Were the Galatians the 12 tribes of Israel? If it didn't pertain to the Galatians why would Paul say such a thing and give these people false hope?