So you're saying that God has two distinct people - Israel and the Church?
Unbelieving Israel are God's people?
Romans 2:28-29
28 For no one is a Jew who is merely one outwardly, nor is circumcision outward and physical.
29 But a Jew is one inwardly, and circumcision is a matter of the heart, by the Spirit, not by the letter. His praise is not from man but from God.
Romans 9:6-8
6 But it is not as though the word of God has failed. For not all who are descended from Israel belong to Israel,
7 and not all are children of Abraham because they are his offspring, but "Through Isaac shall your offspring be named."
8 This means that it is not the children of the flesh who are the children of God, but the children of the promise are counted as offspring.
Dispensational theology is false. Scripture is pretty clear that God has one people and they are true Israel, the church, who believe in the Messiah.