Being in the Land of Israel is important because of the verse Deuteronomy chapter 11 verse 9 which says to do all the commandments of God in order to come to the land and when you are in the land to stay --;''...so that you shall have length of days in the land...'
And the anti Israel religious world does not have a legal leg to stand on. Both Reb Moshe (Feinstein) and Rav Aaron Kotler said: "דינא דמלכותא דינא" the law of the land is the law which means that the State of Israel has the legal (halachic) category of a legitimate state. And the Rav of Satmer (his entire book) is based on one midrash. and midrash has no halachic validity.
And besides that, Rav Joel of Satmer ignored the League of Nations.
The midrash is- "If you go up to the Land as a wall, I will allow your blood to be spilled like the deer of the field''
People did not come to Israel against the will of the nations as the Rav of Satmer had claimed, they came with the will of the nations. Herzel negotiated with the sultan as long as he was in power. The Rothchild's legitimately bought land in Israel from the Ottoman Empire at extremely inflated prices. --In today's currency, that was hundreds of million of dollars. When the empire of the Sultan fell, the League of Nations declared the land of Israel to be for the Jews.
That, at the time, meant all the land of Israel and Jordan. Then they cut it in half. They said in the later "White Paper" that only half would go to the Jews. But there was no time at which they decided that none of Israel would be for the Jews. So the thesis of Rav Joel simply has no halachic validity.
It is important to know this because the importance of Israel is not well known
