I'll admit I don't know everything about the situation with modern Israel, but the idea I hear sometimes that it is on Biblical justification because Jews had it thousands of years ago is a strawman to me.
I've seen this thrown around on forums several times. Perhaps it's a popular idea in Christian America. But in reality a little education about the Zionist movement and the establishment of the state of Israel will show a largely secular movement and pragmatic reasons for the establishment of the state.
Naturally Israel is central in Jewish culture, and there is old Jewish history in the land, but the history of the emancipation in Europe, and real social reasons by the Jews of Europe to find a solution for the state of affairs of their communities are the prime reasons for a homeland for Jews in Palestine.
I've read from anything that the Jews and Israel has a right to the land to that they stole it and that Israel is a terrorist state.
For about four years I maintained that Israel really didn't have a right to the land after learning more about it, and before then, I didn't really have an opinion. Though most recently I think I have realized that maybe I prematurely formed my views on it, though I have my suspicions of how both sides paint each other. If anyone has an opinion on either the formation of modern Israel or Israel's situations in the Middle East politics and world events, I would like to hear it.
The irony is that many people who express these feelings about Israel may live on land which was stolen after committing genocide against the natives, while in the case of Israel many Jews legally bought land from the Turks who ruled Palestine. So whenever American members for example discuss Israel's right to exist on its land, they need to remember they have no rights on their land.
I've had members on this forum lecturing me on the land of Palestine, while I live on land which was legally bought by my family generations ago, where they dried swamps and fought malaria... and in reality these members live on land which was not bought, but literally ethnically cleansed from Native Americans.
But no serious person tells Americans today that they have no right to live on their land. Just food for thought.
Another issue, is that the territorial disputes in the region are not only limited to Israel and the Palestinians. Many other Arab nations around Israel have borders and land disputes between themselves. And the turmoil in Syria at the moment is a testament to the arbitrary postcolonial drawing of borders, as opposing religious and ethnic groups make the Syrian state disintigrate. It's an irony, as nations like Syria have used the Palestinian card against Israel all this time, while they end up killing tens of thousands of Syrians in what is really a regional feud between Shiites, Sunnis and various of other groups.