The promises were spoken to Abraham and to his seed. The Scripture does not say "and to seeds," meaning many people, but "and to your seed," meaning one person, who is Christ. (Galatians 3: 15-16)
Beloe are two of the many other passages clarifying this subject:
Not all who are descended from Israel are Israel. Nor because they are his descendants are they all Abraham's children. On the contrary, "It is through Isaac that your offspring will be reckoned." In other words, it is not the natural children who are God's children, but it is the children of the promise who are regarded as Abraham's offspring. (Romans 9:6-8)
A man is not a Jew if he is only one outwardly, nor is circumcision merely outward and physical. No, a man is a Jew if he is one inwardly; and circumcision is circumcision of the heart, by the Spirit, not by the written code. Such a man's praise is not from men, but from God. (Galatians 3:15-16)
Please please please tell me you haven’t bought into the replacement theology lie.