I presented both. The gathering of the Jews to Israel, which has already happened, and what the future holds for them. We know all about present day Jerusalem, from being a millstone, to being surrounded by her enemies, to a peace treaty that will give away parts of the country, and will lead to war. We know who, what, when, where, and why.
Remove the Jews from the Bible , and there isn't a whole lot left. Jesus, for instance, is a Jewish Rabbi. Even the Gentiles were grafted into the Jewish line. Jews are the root, Gentiles are the shoot. Without the root there is no shoot...