historian said:
That's is a nether bogus comparison. The crusader states were created by the Europeans during the crusades well they conquered parts of the holy land. The modern state of Israel is just a renewal of the ancient state of Israel. The land is theirs, given to them by God.
The Jews have a greater historical claim on Israel than the United States has on America, the British have on Britain, the French have on France, and many other peoples in the world have on their territories.
Understand that the Mosaic covenant with the nation of Israel was a conditional covenant.
"Now if you will obey me and keep my covenant, you will be my own special treasure from among all the peoples on earth; for all the earth belongs to me."
- Exodus 19:5
Their disobedience began with wandering in the desert for 40 years and ended with the Crucifixion of Christ, the destruction of the Temple, and their expulsion from the land. That contract was nullified.
If you are going back to the Abrahamic promise from Genesis 13, well guess what...both Isaac and Ishmael were Abraham's offspring and you run into a bigger problem. Again, that promise was fulfilled in the entire region.
"Look around from where you are, to the north and south, to the east and west. All the land that you see I will give to you and your offspring forever. I will make your offspring like the dust of the earth, so that if anyone could count the dust, then your offspring could be counted. Go, walk through the length and breadth of the land, for I am giving it to you"
- Genesis 13:14-17
There really is no Biblical case for Christian Zionism. The modern state of Israel is a secular creation of the UN that marches in lockstep with all the worst instincts of globalization. If it has any role in prophecy going forward it is merely as a stage set to welcome the Antichrist to a rebuilt satanic temple.