The following link will lead you to a book that every Christian must read.
The book is called: The Church is Israel Now. The book is a few articles down in the web site, so keep scrolling down until you find the book. The books is simply an ordering of Scriptures with very little commentary. Let the Scriptures themselves teach you God's perspective on the Israel question. After reading the book, those who do not come to the conclusion that the Church is Israel now, with all the promises, and obligations that God orginally gave to the Old Testament nation, do not believe in the inerrancy and authority of Scripture.
America's current decline, in no small measure, goes back to its national, unconditional support of the modern nation-state called Israel. As Paul said, "They are not all Jews who call themselves Jews. They are not all Jews who are circumcised in the flesh, but who are not circumcised in the heart." The true Jew, the true Member of the nation of the Israel is such a one who says, "Blessed is He who comes in the name of the Lord - even the Lord Jesus Christ."