The Palestinian Christians have the right to live in Palestine. They are the people of the place. It is their homeland.
But we've been over this before. The Jewish people are also the people of the place. It is also their homeland. They have the right to live there and they have the right to sovereignty over the territory.
Just as the Palestinian Arabs are a people of the place. It is their homeland. They have a right to live there and they have a right to sovereignty over the territory.
See how this equality thing works? Same rights for both peoples.
Now, what you are really trying to argue is that there is no such thing that can be collectively called the "Jewish people" -- rather that there are several distinct groups of Jews. I'll make it easy for you. This is what you are trying to argue:
There are no Jews. There are Ashkenazis. There are Sephardis. There are Mizrahis. And there are Palestinian Jews. Each group of Jews has a different set of rights and ONLY the Palestinian Jews are a people of the place and have rights to live there and hold sovereignty over the territory.
Here are my problems with your argument:
1. Its called self-determination. Not other-determination. You don't get to choose who does and who does not belong to the Jewish people. We do. You can't cut us up and divide us to suit yourself. That is denying us our self-determination.
2. You have already agreed that immigration is one of the privileges of self-determination of a people.
3. I'm concerned that you won't apply your criteria for who is and who is not a "person of the place" equally. For example, you do not speak of recent Arab immigrants to Palestine (post 1925) who are also "foreigners". You never seem to argue that only people who can prove
4. Finally, and most importantly, the idea that expelling a people from their homeland (ethnic cleansing) negates the rights of those cleansed and all of their descendants is morally wrong, in my mind. Creating a diaspora (a moral wrong) must not lead to increased rights for those committing that wrong. Those in a diaspora should have the right to return to their homeland (though not without considering the rights of others).