Sorry but, whether you want or not, you support Replacement Theology and I tell you how:
The Magna Carta of RT - Gal. 4:21-31
&. Needless to remind of, RT stands for Replacement Theology.
1. Gal. 4:21 - It means that the Church of Galatia used to be a Nazarene synagogue which Paul had overturned into a Christian church.
2. Gal. 4:22 - Abraham had two sons: Ishmael with Agar and Isaac with Sarah.
3. Gal. 4:23 - Ishmael was born after the flesh and Isaac was born after the promise.
4. Gal. 4:24 - Two Covenants: The Jewish one points to bondange after Agar.
5. Gal. 4:25 - Agar points to Jerusalem in bondage under the Jews.
6. Gal. 4:26 - The Promised Jerusalem from above is free and the mother of Christianity.
7. Gal. 4:27 - Christians must rejoice as Sarah for mothering many more children aka Christians.
8. Gal. 4:28 - Christians, after Isaac, are the children of the promise in Jesus.
9. Gal. 4:29 - Jews who are born after the flesh persecute Christians who are born of the spirit.
10. Gal. 4:30 - Scripture says to cast out Agar aka the Jewish covenant and her son aka the Jews for they shall not be heir with Isaac aka Christians, the son of Sarah aka Christianity.
11. Gal. 4:31 - Christians are not children of Agar, the bond woman but of Sarah the free one.
12. Conclusion - Can any one still claim that there is no RT in the New Testament? Hardly!
Nothing in the passage says that the church replaces Israel. Indeed, it is obvious that the passage is talking of spiritual things: nothing prevents Jews from believing in Jesus and becoming heirs of Abraham, who believed and was accredited as righteous before he was circumcised as well as being heirs of Abraham according to the flesh by being circumcised.
Whether or not the Jews are the covenant people of God is matter between you and God and nothing to do with the Bible or Christians. Christians believe, as Paul taught, that in Christ (i.e. through faith in him) there is no distinction between Jew and non-Jew because they have been merged into one new man. This does not mean that there is now no longer any Jew or that Christians have replaced Jews. Neither does it mean that in order tobecome Christian a Jew must abandon his Jewishness. It just means that
in the church, we don't see Jews any differently to the way we see non-Jews. The distinction is obsolete.
Paul is speaking metaphorically, (see v 24), encouraging those who still think that being Jewish saves them or who think that keeping the law saves them, to escape from such bondage and become heirs of Abraham through their faith. He isn't saying that they must abandon their Jewishness.
The issue exists very much today with the fanatics in Israel who think that because God promised them the land that they have a right to it. That being Jewish somehow makes them better than others and gives them a right to be violent. That is the same bondage as Paul is describing. Wanting something better for Jews is not replacement theology.