The tree is Christ not the nation of Israel. The Jews were cut off due to their rejection of Christ and the Gentiles were grafted in by their believe. At the end time a remnant of the Jews will be grafted in again.
NOT REMOTELY Biblically true.
God declared that as long as there were sun, moon, stars, HIS EVERLASTING PROMISTS TO THE CHILDREN OF ABRAHAM, ISAAC AND JACOB WOULD REMAIN IN FORCE.
Disbelieve God Almighty at your own risk.