just as "Abraham put his faith in God, and it was credited to him as right standing with God"?

So you see, it is the men of faith who are the real descendants of Abraham.

Because the Scripture foresaw that God would bring the heathen into right standing with Himself on condition of faith, He beforehand proclaimed the good news to Abraham in the promise, "It is through you that all the heathen will be blessed."

So the men of faith are blessed as partners with trusting Abraham.

that the blessing promised to Abraham might through Jesus Christ come to the heathen, so that through faith we might receive the promised Spirit.

Now the promises were made to Abraham and his descendant. It does not say, "and to your descendants," in the plural, but in the singular, "and to your descendant," that is, Christ.

For if our inheritance depends on the law, it can no longer depend on the promise. But it was by promise that God so graciously bestowed it upon Abraham.

And if you belong to Christ, then you are real descendants of Abraham, and heirs in accordance with the promise made to him.

For the Scripture says that Abraham had two sons, one by a slave girl, the other by a free woman.