Rom 11 Paul makes it very clear Israel was cut-off while the Gentiles were grafted in.
Simply not true. He reiterates again and again the remnant language of the OT, and explicitly says "If some of the branches have been broken off, and you, though a wild olive shoot, have been grafted in among the others and now share in the nourishing sap from the olive root, do not consider yourself to be superior to those other branches. If you do, consider this: You do not support the root, but the root supports you. "
Clearly, not all the branches have been cut off, and some will be reattached. He is not making any sweeping statement about a switch in election between ethnic groups - quite the opposite, salvation is by faith alone, to both Jew and Gentile, and always has been.
When Paul was proving to the Jews that God does not solely base His choices on physical descent, Paul skipped a generation not using Isaac and Ishmael.
"6 It is not as though God’s word had failed. For not all who are descended from Israel are Israel. 7
Nor because they are his descendants
are they all Abraham’s children.
On the contrary, “It is through
Isaac that your offspring will be reckoned.” 8 In other words, it is
not the children by physical descent who are God’s children,but it is t
he children of the promise who are regarded as
Abraham’s offspring. 9 For this was how the promise was stated: “At the appointed time I will return, and
Sarah will have a son.”"
And from Galatians: "22 For it is written that
Abraham had two sons, one by
a slave and the other
by a free woman. 23 But the one by the slave was born
according to the impulse of the flesh, while the one by the free woman was born a
s the result of a promise. 24 These things are illustrations, for the women represent the t
wo covenants. One is from Mount Sinai and bears children into
slavery—this is Hagar. 25 Now Hagar is Mount Sinai in Arabia and corresponds to the present Jerusalem, for she is in slavery with her children. 26 But t
he Jerusalem above is free, and she is our mother.27 For it is written:Rejoice, childless woman,
who does not give birth.
Burst into song and shout,
you who are not in labor,
for the children of the desolate are many,
more numerous than those
of the woman who has a husband.
28 Now
you, brothers, like Isaac, are
children of promise.
Had Paul used Isaac and Ishmael then the Jews would respond that God chose Isaac over Ismael based upon physical descent for Isaac was the true son of Abraham and his true wife Sarah while Ismael was the son of a handmaid.
Paul doesn't enter into discussions of legitimacy - in any case, I'm not even sure that in that time period and culture there would be seen to be a difference in legitimacy between the a son born of someone not your wife. What would matter is the eldest. In any case, Paul's argument turns not on legitimacy, but who was the child of the promise? Clearly, that is Isaac, who is the result of the promise that Sarah would be with child.
By skipping a generation and using Israel/Jacob and Edom/Esau where both were the descendants of Isaac whom the Jews considered the true son of Abraham. So the Jews could not make the same argument between Israel/Jacob and Edom/Esau as they could between Isaac and Ismael. So Edom/Esau were as much descendants of Isaac and Abraham as Israel/Jacob yet Edom was not chosen.
As above.
In Rom 9, God is not choosing individuals to salvation but God chose a nation, Israel. God chose the individuals Abraham, Isaac and Jacob to bring about that nation. God foreknew Israel would be a better choice over Edom to use to bring the Messiah into the world.
Paul's point is that it is children of the promise that inherit, not the children of physical descent, even the children of physical descent of Isaac.
"6 Just as Abraham believed God, and it was credited to him for righteousness, 7 then understand that those who have faith are Abraham’s sons. 8 Now the Scripture saw in advance that God would justify the Gentiles by faith and told the good news ahead of time to Abraham, saying, All the nations will be blessed through you.9 So those who have faith are blessed with Abraham, who had faith."
And I'm happy to accept in this case God choosing Israel over Edom as a better choice for his purposes - the point is that God actively intervened in order to bring that about. If God had not intervened, that would not have happened
Why did God choose Abraham? "For I know him, that he will command his children and his household after him, and they shall keep the way of the LORD, to do justice and judgment; that the LORD may bring upon Abraham that which he hath spoken of him" Gen 18:19. God foreknew Abraham would be obedient enough that God could accomplish His will using Abraham.
Actually, it's not at all clear that what this passage is saying is that God knew (i.e. knew in advance) that Abraham would be a good guy, and that is the basis of the election. The meaning of 'know' here does not necessarily mean passive foreknowledge, and indeed even the language of the KJV allows for the meaning that God's knowing of Abraham (or his entering into covenant), is what allows him to do these things : I know him [in order] that he will command his children.
In any case, even if I accept your reading at face value, the problem still remains - none of what God says about Abraham in this verse would come true if it were not for God's interventionism. If God had left Abraham in Ur, nothing would have happened. Instead, he was called.
Gen 25:23 "And the LORD said unto her, Two nations are in thy womb, and two manner of people shall be separated from thy bowels; and the one people shall be stronger than the other people; and the elder shall serve the younger."
God foreknew there were two manner of people, two different nations within Rebekah > Israel and Edom and God foreknew that Israel would be the better choice. Both nations would be disobedient to God and deserve punishment but God foreknew He would be able to use Jacob/Israel to accomplish His purpose in bringing the Messiah into the world through them and would not be able use Esau/Edom.
As above. None of what God says about Jacob and Isaac, before they are even born, would be true if God had not said anything, or intervened in order to make Jacob the inheriter of the promise.
God chose Jacob over Esau for God foreknew Esau would be profane. As Paul said in Rom 9 "For the children being not yet born, neither having done any good or evil..." God made His choice before either Jacob or Esau was born, so the Jews could not argue that God chose them based upon anything either Jacob/Israel or Esau/Edom had done, it was God's own choice.
As above. They had done nothing, and so God intervenes to choose Jacob before anything is done by them. It is not about passive foreknowledge, because everything that comes after is a direct result of God's promise. If God had not promised and chosen Jacob, the end of Genesis would in all likelihood read very differently.
The thing God fore-saw in Abraham in Gen 18:19, He also fore-saw in Isaac, Jacob and Israel but did not fore-see it in Esau and Edom. Yet God having chose Abraham, Isaac and Jacob, none were perfectly obedient to God but God foreknew they would all obey Him enough that He could accomplish HIs purpose through them in bring Israel, and eventually the Messiah, into the world.
Again, as above.