According to God, the land belongs to the Jews. And this goes back thousands of years.
"Therefore say, ‘Thus says the Lord God: I will gather you from the peoples, and assemble you out of the countries where you have been scattered, and I will give you the land of Israel.’" - Ezekiel 11:17
“Know therefore, that the Lord your God is not giving you this good land to possess because of your righteousness; for you are a stubborn people." - Deuteronomy 9:6
As one can see from the Scripture quoted, whether or not the Jewish people conduct themselves righteously does not take away God's promise to them that they have a right to that land since God gave them the land despite their unrighteousness.