You really know how to change the subject when you have been proven wrong. Hooray to your victory dance.
It mattered about the blood of Abraham because God promised him that there would be a blood relative of his to sit on the throne. Jesus is blood related to Abraham. Since Jesus has come, it only matters about his blood and who has faith in it.
Read what God says.
John 1:13 children born not of natural descent, nor of human decision or a husband's will, but born of God.
See during the time of the old law, one only had to be blood related to Abraham, get circumcised...do the ceremonial/purification works and the person would be called a child of God.
That is natural descent, and that is no more since Jesus.
And, a person could decide that they wanted to convert to Judaism; all they would have to do is to obey the ceremonial/purification works and they would be called a child of God.
That is human decision and that is no more since Jesus.
And, a Jew husband could marry a non Jew and tell her she must become a Jew, and all she would have to do is do the purification/ceremonial works and be called a child of God.
That was called a husband's decision.
That is the way it was, but since Jesus that would be the way no more.
See God did not like it that a person could get circumcised, sacrifice an animal and do the other ceremonial works but not really be sorry for their sins and stop sinning.
God said that He would make a new covenant.
That new covenant is what Jesus taught and died for.
Now Jesus saves us all on his own, and he tells us that he saves those who have faith that he washes away the sins they repent of and call on him.
Jesus tells us how to get to that point in life.