Chapters 9 thru 11 deal with the Sovereignty of G-d and G-d's righteousness in election.
Romans 9:1-5 I say the truth in Messiah (Christ), I lie not, my conscience also bearing me witness in Ruach HaKodesh (the Holy Spirit), That I have great heaviness and continual sorrow in my heart. For I could wish that myself were accursed from Messiah for my brothers, my kinsmen according to the flesh: Who are Israelites; to whom pertains the adoption, and the glory, and the covenants, and the giving of the law, and the service of G-d, and the promises; Whose are the fathers, and of whom as concerning the flesh Messiah came, who is over all, G-d blessed for ever. Amen.
Sha'ul (Paul) is so burdened for his fellow Israelites that he states that he would be willing to be "accursed", die and go to hell, if it would help them to come to know Yeshua as their Messiah.
Romans 9:6 Not as though the word of G-d has taken none effect. For they are not all Israel, which are of Israel:
Just because someone has Jewish ancestry does not make them a member of the nation of Israel according to G-d.
Romans 9:7 Neither, because they are the seed of Avraham, are they all children: but, In Yitz'chak (Isaac) will your seed be called.
We are children of G-d, not because we are descendents of Avraham (flesh) But through promise (through Yitz'chak (Isaac) your descendants will be named) Yitz'chak (Isaac) is one example. . G-d promised Sarah, even though she was old and barren she conceived. She even laughed. And G-d said is anything impossible with G-d? This was a foreshadowing of the virgin birth. Even though Miryam had not known a man she conceived Yeshua. Is anything impossible with G-d?
Yeshua stated: Yochanan (John) 8:33-37 They answered him, We be Abraham's seed, and were never in bondage to any man: how say you, You will be made free? Jesus (Yeshua) answered them, Verily, verily, I say to you, Whosoever commits sin is the servant of sin. And the servant abides not in the house forever: but the Son abides ever. If the Son therefore will make you free, you will be free indeed.
It is the children of the promise that are the children of G-d here and those that will go to heaven. (Other world)
Yeshua said in Yochanan (John) 8:47 He that is of G-d hears G-d's words: you therefore hear them not, because you are not of G-d.