Israel is not supreme, Christ is. He is the vine, we are the branches
Go re-read Romans. Third chapter and 11th chapter. If you do so WITHOUT your cultural blinders you may walk away with a different perspective.
First off, from chapter 11 (speaking specifically of Jews - including the "enemies of the gospel")
29 for the gifts and the calling of God are
irrevocable.
IOW, God cannot/will not revoke physical Israel's being "chosen."
And keeping that fact in mind, let us go to chapter 3:
1 Then what advantage has the Jew? Or what is the benefit of circumcision?
2 Great in every respect. First of all, that
they were entrusted with the oracles of God.
And since that is "irrevocable," they STILL ARE.
Israel/the Jews are the tree trunk and we gentile believers are grafted into that stock. (back to chapter 11)
17 But if some of the branches were broken off, and you, being a wild olive, were grafted in among them and became partaker with them of the rich root of the olive tree,
18 do not be arrogant toward the branches; but if you are arrogant,
remember that it is not you who supports the root, but the root
supports you.
19 You will say then, “Branches were broken off so that I might be grafted in.”
20 Quite right, they were broken off for their unbelief, but you stand by your faith. Do not be conceited, but fear;
21 for if God did not spare the natural branches, He will not spare you, either.
22 Behold then the kindness and severity of God; to those who fell, severity, but to you, God’s kindness, if you continue in His kindness; otherwise you also will be cut off.
23 And they also, if they do not continue in their unbelief, will be grafted in, for God is able to graft them in again.
24 For if you were cut off from what is by nature a wild olive tree, and were grafted contrary to nature into a cultivated olive tree, how much more will these who are the natural
branches be grafted into their own olive tree?