They weren’t chosen by God to accept Jesus. They relied on circumcision of the flesh. Christians are the true sons of Abraham. By faith are ye saved.
13 See, my servant will act wisely[b];
he will be raised and lifted up and highly exalted.
14 Just as there were many who were appalled at him[c]—
his appearance was so disfigured beyond that of any human being
and his form marred beyond human likeness —
15 so he will sprinkle many nations,[d]
and kings will shut their mouths because of him.
For what they were not told, they will see,
and what they have not heard, they will understand.
Isaiah 52:12-15
>> “Christians are the true sons of Abraham” <<
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The Bible says “seed of Abraham.” But so are Jews and the house of Ephraim part of the seed of Abraham.
More importantly, no gentile is part of Israel. Israel is Israel. You don’t have any way of knowing who God has chosen, and who he’ll reject, and it is not yet time for those things to be revealed.