I think that whether they are or they aren't physical descendants doesn't change anything, now that Christ has come.
Jesus openly calls physical decedents of Abraham, who refused to believe in him, children of Satan:
John 8
"37I know that you are Abraham’s descendants; yet you are seeking to kill Me, because My word has no place in you. "
...
"44You are of your father the devil, and you want to do the desires of your father. He was a murderer from the beginning, and does not stand in the truth because there is no truth in him. Whenever he tells a lie, he speaks from his own nature, because he is a liar and the father of lies. "
Meanwhile, Paul says that every person who has been baptized into Christ is now Abrahams seed and an heir to the promises:
Galatians 3:26-29 "You are all sons of God through faith in Christ Jesus. For all of you who were baptized into Christ have clothed yourselves with Christ. There is neither Jew nor Greek, slave nor free, male nor female, for you are all one in Christ Jesus. And if you belong to Christ, then you are Abraham’s seed and heirs according to the promise."
I think that whether they are or they aren't physical descendants doesn't change anything, now that Christ has come.
Jesus openly calls physical decedents of Abraham, who refused to believe in him, children of Satan:
John 8 "37I know that you are Abraham’s descendants; yet you are seeking to kill Me, because My word has no place in you. " ... "44You are of your father the devil, and you want to do the desires of your father. He was a murderer from the beginning, and does not stand in the truth because there is no truth in him. Whenever he tells a lie, he speaks from his own nature, because he is a liar and the father of lies. "
Meanwhile, Paul says that every person who has been baptized into Christ is now Abrahams seed and an heir to the promises: Galatians 3:26-29 "You are all sons of God through faith in Christ Jesus. For all of you who were baptized into Christ have clothed yourselves with Christ. There is neither Jew nor Greek, slave nor free, male nor female, for you are all one in Christ Jesus. And if you belong to Christ, then you are Abraham’s seed and heirs according to the promise."