When people work, their pay is not regarded as a gift but something they have earned.
However, when people don't work but believe God, the one who approves ungodly people, their faith is regarded as God's approval.
David says the same thing about those who are blessed: God approves of people without their earning it. David said,
"Blessed are those whose disobedience is forgiven and whose sins are pardoned.
Blessed is the person whom the Lord no longer considers sinful."
Are only the circumcised people blessed, or are uncircumcised people blessed as well? We say, "Abraham's faith was regarded as God's approval of him."
How was his faith regarded as God's approval? Was he circumcised or was he uncircumcised at that time? He had not been circumcised.
Abraham's faith was regarded as God's approval while he was still uncircumcised. The mark of circumcision is the seal of that approval. Therefore, he is the father of every believer who is not circumcised, and their faith, too, is regarded as God's approval of them.
He is also the father of those who not only are circumcised but also are following in the footsteps of his faith. Our father Abraham had that faith before he was circumcised.
So it was not by obeying Moses' Teachings that Abraham or his descendants received the promise that he would inherit the world. Rather, it was through God's approval of his faith.
If those who obey Moses' Teachings are the heirs, then faith is useless and the promise is worthless.