All cease being either Jew or Gentile once they are found to be in Christ. ( Galatians 3:28 )
Yet!
Gentiles who are now being saved during the church age?
If they are faithful to mature in grace and truth?
These faithful ones are grafted into the system for God's blessings that the Jews had before the Church age,
and had exclusively enjoyed.
If the part of the dough offered as firs fruits is holy, then the whole batch is holy;
if the root is holy, so are the branches.
If some of the branches have been broken off, and you, though a wild olive shoot,
have been grafted in among the others and now share in the nourishing sap from
the olive root, do not consider yourself to be superior to those other branches.
If you do, consider this: You do not support the root, but the root supports you.
You will say then, “Branches were broken off so that I could be grafted in.”
Granted. But they were broken off because of unbelief, and you stand by faith.
Do not be arrogant, but tremble. For if God did not spare the natural branches,
he will not spare you either." Romans 11:16-21
Christians can not lose their salvation.
But we can lose God's blessings. Blessings that He would bestow upon us (like He had for the Jews)
for those who continue to remain faithful.
In contrast to blessings... those who wander off into false thinking, they will be cut off from God's "nourishing sap"
and will be left to wither and shrivel on the tree. Then, broken off.
grace and peace ..........