The Jews who followed Jesus are the Jews who are God's elect. (And the Gentiles who are grafted onto the vine -- they too are God's elect.)
The Jews who reject Jesus are like the rebels who followed Korah. Are Korah's rebels still God's elect? Obviously not.
As John the Baptist said centuries later, God can make descendants for Abraham out of stones. Ethnicity or blood mean nothing.
Disagree? Take it up with John the Baptist.
The Good News is, anyone still alive, Jew or Gentile, can become part of the Chosen People by accepting Jesus. But reject Jesus, and you walk away from being Chosen. God is not replacing you. You've replaced yourself.
Well put angelino. As paul wrote in galatians 3
d] 9 So those who rely on faith are blessed along with Abraham, the man of faith.
14 He redeemed us in order that the blessing given to Abraham might come to the Gentiles through Christ Jesus
28 There is neither Jew nor Gentile, neither slave nor free, nor is there male and female, for you are all one in Christ Jesus. 29 If you belong to Christ, then you are Abraham’s seed, and heirs according to the promise.