No, I absolutely believe God is no respecter of persons. Nor do I believe all the "natural children" of Israel are part of the true Israel.
Most people are hard pressed to explain how God knew two sons representing two nations were about to be born to Rebekah and how they would turn out. Ever wonder why Esau and Cain were older but turned out poorly? Why have the bad sons born first? Why let them start off with the birthright?
Why did God love Isaac but hate Esau? The word "hate" should probably be translated as "avoided" in the passage.
Malachi 1:2 I have loved you, saith the Lord. Yet ye say, Wherein hast thou loved us? Was not Esau Jacob's brother? saith the Lord: yet I loved Jacob,
3 And I hated Esau, and laid his mountains and his heritage waste for the dragons of the wilderness.
Maybe a new thread would be in order? I can deal with it either way since "forgiveness" is still involved.
We find the book of Job starting off by saying he was perfect. So why was Satan given power over him? And when Job repented, what did he repent of? If Job represents Israel, why was he told to sacrifice then for his three Gentile friends?
For each of your questions and mine, God has answers, but the answers for you may not work for me and vice versa. God has lessons, I believe for each of us in accord with what we are and where we are at the moment. I believe there have been a lot of studies done with regard to hating Esau, but probably not so much about the older children turning out poorly. I had thoughts myself about the perfection of Job, but not lately. I have considered him as perfect early with what he had in the way of gifts and experiences. He then went through trials allowing him the opportunity to grow some more.