I remember reading Hal Lindsey's Late Great Planet Earth back in the early 70's. Those who remember that first book will recall how Mr. Lindsey laid out a careful argument on how the great bear was going to sweep from the north to attack Israel. The bear at that time is now the Soviet Union. I thought that was great theology until the Soviet Union broke apart. Over the last several decades Mr. Lindsey modified and changed his interpretations to fit with current events but he lost at least one reader. My point isn't to criticize Mr. Lindsey but to illustrate that it's very easy to read anything, anyone wants in scripture and conform their beliefs based upon their surroundings and not on good theological development.
God may use Israel to accomplish His will but that's it. Please keep in mind the Muslims are saying that God is using and blessing them? Personally, I think they have a stronger case. Fact is, however, God raises those nations who He so chooses for His will. What that will is none of us really know and any mapping to scripture is speculation at best.
"Why would God change now and bless them; the people that reject His Son?
God may use Israel to accomplish His will but that's it. "
I'm a post millenial Christian Zionist.
Read Romans chap 11 and 12 in any version you choose. Those chapters were written for such a time as this and deal directly with the issues you are raising. The Jews are blind to the Truth. The reason why is given. The end of that blindness and a wholesale turing to Jesus by Jews is what I see in the Bible.
God is keeping a promise he made to His friend Abraham. God keeps his promises. As a Gentile I don't advise boasting against the natural branches. We can be cut off as easily as a Jew. They can be grafted in more easily than we were grafted in. The Jew BELONG in the olive tree.