I think the crux of some of our argument is answered by this:
Isaiah also cries out concerning Israel:
“Though the number of the children of Israel be as the sand of the sea,
The remnant will be saved.
28 For He will finish the work and cut it short in righteousness,
Because the Lord will make a short work upon the earth."
29 And as Isaiah said before:
“Unless the Lord of Sabaoth had left us a seed,
We would have become like Sodom,
And we would have been made like Gomorrah."
Present Condition of Israel
30 What shall we say then? That Gentiles, who did not pursue righteousness, have attained to righteousness, even the righteousness of faith; 31 but Israel, pursuing the law of righteousness, has not attained to the law of righteousness. 32 Why? Because they did not seek it by faith, but as it were, by the works of the law. For they stumbled at that stumbling stone. 33 As it is written:
“Behold, I lay in Zion a stumbling stone and rock of offense,
And whoever believes on Him will not be put to shame.”