My thought is that the Church hasn’t superseded blood Israel as the media for God’s work. The person of Jesus Christ, who is of the blood of Israel, is Himself the media through which God works in the world, through the Holy Spirit and the church catholic. So, I would think that God’s redemptive activity as being more cooperative between blood Israel and the church Israel, and that this partnership is through the ‘jewishness’ of Jesus Christ. Functionally, the church is the witness-bearer, as they are the ones who have glimpsed “what no eye as seen” through Christ. The church doesn’t deal in typologies, but rather through sacramental realities. The Christ that is seen in the most holy sacrament of the altar, that Body which we reverence there, is a Jewish body. It seems to be God’s will for this cooperation between the two Israels to persist for the missio dei. For what is the mission of God other than making Christ known, bringing sheep back into His fold, and feeding them with his own flesh for their growth, health, and absolution? That work is done with (mostly) gentilic hands elevating Jewish flesh above the altars of the God of Israel.

That said, and for the sake of your thesis, I’m wondering if the range of your argument should include not only the question of how “one” can be saved, but the media through God himself pursues the “missio dei.” Does the Church supersede “blood” Israel as the spearhead of God’s redemptive activity and the witness-bearer to the inbreaking of the Kingdom?