And of course:
Romans 4:
The purpose (circumcision AFTER faith credited as righteousnesses) was to make him (Abraham) the father of all who believe without being circumcised, so that righteousness would be counted to them as well,
12and to make him the father of the circumcised who are not merely circumcised but who also walk in the footsteps of the faith that our father Abraham had before he was circumcised.
13For the promise to Abraham and his offspring that he would be heir of the world did not come through the law but through the righteousness of faith.
14For IF it is the adherents of the law who are to be the heirs, faith is null and the promise is void.
15For the law brings wrath, but where there is no law there is no transgression.
16That is why it depends on faith, in order that the promise may rest on grace and be guaranteed to all his offspring—not only to the adherent of the law but also to the one who shares the faith of Abraham, who is the father of us all,
17as it is written, “I have made you the father of many nations”
(emphasis added is mine)
iow: ONE PEOPLE - with Abraham as their father - a lineage acquired through faith in the promise of God.
...faith...ALONE