Blood lines have no value as far as having God's approval is concerned. In a spiritual sense Abraham is the father not only of his natural offspring who were faithful to Jehovah God but also of all disciples of Jesus Christ.
(Romans 4:11) And he received a sign—namely, circumcision—as a seal of the righteousness by the faith he had while in his uncircumcised state, sothathe might be the father of all those having faith while uncircumcised, in order for righteousness to be counted to them;
(Romans 2:28, 29) For he is not a Jew who is one on the outside, nor is circumcision something on the outside, on the flesh. 29 But he is a Jew who is one on the inside, and his circumcision is that of the heart by spirit and not by a written code. That person’s praise comes from God, not from people.
(Acts 10:34, 35) At this Peter began to speak, and he said: “Now I truly understand that God is not partial, 35 but in every nation the man who fears him and does what is right is acceptable to him.
