"What about Israel?" is the theme throughout Romans 9-11, and yet not one single Calvinist commentator can answer that question, even though Paul LAID IT OUT right under their noses. .
If I may respectfully respond to your point, Dr. Ach. The theme throughout Romans 9-11 is of vital importance to every serious Christian. In Romans 8, Paul has just declared that God's love cannot fail. Nothing can stand in the way of it. Nor is anyone or anything greater who can separate us from His love.
Having said that, Paul feels it necessary to explain the failure of Israel (with the exception of a few) to believe and receive their Messiah. He illustrates this perplexing question by listing all the numerous advantages given the Jews. Yet, despite these wonderful privileges, they did not believe.
The inevitable question then arises, Did the Word of God fail?.....i.e., Did God's love for Israel fail?
His answer is shocking. "For they are not all Israel which are of Israel."
Paul then enters into the controversial teaching of election by His grace alone. It concerns people....specific people whom he names.
Paul was not introducing a new heretical doctrine. Instead he was explaining Old Testament theology that is applicable today.
God will have mercy upon whom He will have mercy.
It was true in the Garden. It was true with Moses. It is true with Christ and it is true in the 21st century.
It is God's will alone which dictates who are the Elect and who are the Reprobate.
Thus, it was never God's will that all Israel would receive Christ as Messiah.
However, Paul promises that there is a remnant of Jews who will absolutely come to saving knowledge of our Lord and Savior. So all is not lost because God has elected and predestined them to be among the called.
Is it not humbling to know that the Lord willed to have mercy on us undeserving sinners?