Why supercessionism doesn't work

To believe in Christ is nothing other than to live from “the root.” If Israel’s identity was always derivative and “eccentric,” created and sustained by the calling of God, its nature is neither erased nor altered by its response in faith to God’s calling in Christ. The olive tree allegory renders impossible the claim that Israel has been superseded by Gentiles or absorbed into a non-Jewish realm known as “the church.” To the contrary, it is Gentiles who are “grafted in,” but what they join is a people and a mode of existence utterly dependent on “the gifts and the calling of God” (11:29).—J. M. G. Barclay, Paul and the Gift, 553