The ancestrial claim might hold up if there was documentation for it. Title must be legally exchanged in order to lose ownership. Say your family owned a piece of land. Through the centuries, your family moved from it. When you return, if you can prove that you maintained ownership, you may have a claim. This is a strange case. One side holds that GOd gave them the land. The other says that it is religiously important, but more than that, it was vacant and unused. Now, the spiritual part will not work in court. However, there is something to be said that they owned it before. True, it was unused, but is it fair to say “It is ours now, you are out of luck?”
The best solution is to destroy every structure on there and let no religion claim it. It can then be a empty space to show the only way we can all get along is to sacrafice our own desires so that all can have a little.
As far as the tribes mostly being Muslim now, that is probably true. However a good Jewish person would say that when they left the faith, they lost their share.