The promise made to Abraham and his offspring that he should inherit the world, did not reach him through the Law, but through the righteousness of faith.
meaning that instead of God's children being the children born to him by natural descent, it is the children of the Promise who are reckoned as his true offspring.
as well as a father of those circumcised persons who not only share circumcision but walk in the steps of the faith which our father Abraham had as an uncircumcised man.
It was by faith that Noah, after being told by God what was still unseen, reverently constructed an ark to save his household; thus he condemned the world and became heir of the righteousness that follows faith.