Having already establish in Romans 4:13-18 and 8:14-18 that it is we, the saints, both Greek and Jew, who are the children of the promise / the children of God, Paul says in 9:6-8 that the reason that the fact the most Israelites are not being saved is not a failure of God’s word is that the Israelites who are not being saved (most Israelites) are not the Israel that is to be saved in accordance with God’s word regarding His New Covenant with the house of Israel, Paul explaining that it is not the children of the flesh (they, the Jews [non-saints]) who are these children of God (already identified as us, the saints, both Greek and Jew), but the children of the promise (already identified as us, the saints, both Greek and Jew) who are counted (not descended) for the seed that is called in Isaac to receive the promise.

Thus, Paul establishes in 9:6-8 that it is not they, the Jews (non-saints), but we, the saints, both Greek and Jew, the very ones who are in fact being saved, who are the Israel that is to be saved in accordance with God’s word regarding His New Covenant with the house of Israel. Thus, God’s word has not failed. Paul reaffirms this in 9:22-24, stating that God patiently endured the vessels of wrath (them, the Jews [non-saints]), so that He would make known His glory on the vessels of mercy (us, the saints, both Greek and Jew), whom He "called," namely, "US," both out of the Jews and out of the Gentiles. Then he summarizes in 9:30 - 10:3, stating that the "Gentiles" (the Gentile aspect of us, the saints, both Greek and Jew, the "Israel" that is being saved in accordance with God’s word in 9:6-8) are receiving in the New Covenant through faith in Christ what "Israel" (they, the Jews [non-saints]) is not receiving in the Old Covenant through the law of Moses.

Thus, in 9:6-8 and in 9:31 - 10:3 (and also in 11:7-11), Paul establishes two different Israels, a saved/believing Israel (us, the saints, both Greek and Jew, the vessels of mercy) and an unsaved/unbelieving Israel (them, the Jews [non-saints], the vessels of wrath).

These two Israels in 9:6-8 and in 9:31 - 10:3 (and also in 11:7-11) are the two parts of Israel described in 11:25, which are analogized as the two parts of the cultivated tree in 11:16-24. As Paul says in 11:16-24/11:25, part of the tree/Israel does not believe in Christ, and thus is separate and distinct from the part of the tree/Israel that believes in Him, until the Gentiles enter into the part of the tree/Israel that believes in Him, after which the unbelieving/separate part of the tree/Israel can likewise believe in Him and enter into the part of the tree/Israel that believes in Him. These two parts of the tree/Israel, the unbelieving part (they, the Jews [non-saints]) and the believing part (we, the saints, both Greek and Jew), are the two Israels in 9:31 - 10:3 and 11:7-11 (unbelieving Israel / they, the Jews [non-saints]) and in 9:6-8 (believing Israel / we, the saints, both Greek and Jew).

Then Paul says in 11:26 that it is in this manner (in this stated sequence) that all Israel (all three parts: the believing part, the entering Gentile part, and the subsequently entering no-longer-unbelieving part) is to be saved (is to believe in Christ). Nowhere does Paul suggest that there will be a separate salvation for a future generation of the Jews or that there will be vessels of mercy other than "us." He specifically says that they (the Jews, [non-saints] will have to believe in Christ and be engrafted together with "us" (the saints, both Greek and Jew) in the believing part of the tree/Israel (9:6-8) in order to be saved. "They" will have to become "us," just as everyone who would be saved must do.

Paul describes only one saved group. "We" are it. "We," the saints, both Greek and Jew, are the saved, New Covenant "Israel" (9:6-8 and 11:26) predicted by Jeremiah. God’s word has not failed. That’s why Paul says in Ephesians 2:12 that the Gentile saints at Ephesus used to be, as unbelievers (but are no longer, as believers), (1) without Christ, (2) excluded from the citizenship of Israel (New Covenant Israel, whose citizens are the saints [we], both Greek and Jew), and strangers from the covenants of the promise (the promise of the Abrahamic Covenant being realized in the New Covenant).