Colossians 3:11-12
And in that image there is no room for distinction between Greek and Jew, between the circumcised and the uncircumcised, or between the barbarian and Scythian, slave and free. There is only Christ: He is everything and He is in everything. As the chose of God, then, the holy people whom he loves, you are to be clothed in heartfelt compassion, in generosity, and humility, gentleness, and patience.
Galatians 3:28-29
There can be neither Jew nor Greek, there can be neither slave nor freeman, there can be neither male nor female-for you are all one in Christ Jesus. And simply by being Christ's you are that progeny of Abraham, the heirs named in the promise.
1 Peter 2:9
But you are a Chosen race, a kingdom of priests, a holy nation, a people to a personal possession to sing the praises of God who called you out of the darkness into his wonderful light.
All men are the creation of God, and in Christ creation is redeemed and restored. Though it is not fully restored yet as the world has not be remade. As we see in Christ all are made heirs to Abraham. The old covenant, a covenant that is exclusive, is made over into the new covenant that is open to all. As St. Paul tells us no longer is there Jew or Greek. We are one creation of God again reconciled by Jesus Christ through whom their is salvation and without whom there is no salvation. God fulfilled His promise to Israel and sent a savior. In doing so He redeemed His entire creation as He always intended to do. Thus anyone that accepts Christ is Israel and anyone that rejects Christ has no salvation. The covenant is everlasting, the old exclusive covenant is not.
Show me a single New Testament Scripture that would state there is any salvation in the law.