One of the problems we run into in the Church is that we have not seen the difference between dust and stars. Let me explain.
In Genesis 13:16, when Abram chose his land and decided to settle in it, God said to him, “Abram, I will make your descendants as the dust of the earth.”
Genesis 15:6, states that Abram “believed the Lord, and it was credited to him as righteousness.” The remainder of our faith rests on this foundation verse. Accompanying this statement, God said, “Abram, your descendants will be as plentiful as the stars.”
The double promise is repeated in Genesis 22:17 when the Lord says; “I will surely bless you and make your descendants as numerous as the stars in the sky and as the sand on the seashore.”
Examine this analogy of dust and stars. Even a casual student of the New Testament understands that Abraham actually received a double line of descendants. First, you have the Jews, Abraham’s earthly descendants by their physical heritage, as numerous as dust. Then, you have all the believers, Abraham’s heavenly descendants by spiritual heritage, as numerous as stars. Abraham ended up with two great families! Unless we keep these families separate, we will get into all kinds of problems. The beautiful thing we have in common is the same father, Abraham.
So, Abraham is the spiritual father of anyone who believes and is saved without obeying any Laws. Those who don’t keep the rules in hopes of being in right-standing with God are justified by God through faith. Abraham is also the spiritual father of those Jews who have been circumcised. They can see from his example that it is not this ceremony that saves them, because Abraham found favor with God by faith alone, before he was circumcised.
If interested, you can download the entire study of The Letter to Christians at Rome