Fair, I was confused by your parallell between religious groups (christianity, islam) vs ethnicities (amish or ethnic jews). Now that you clarified, your argument makes more sense to me.
I agree with you - nobody should be displaced from their homes, even in the face of somebody elses “home claim”, since this would eternally perpetuate the same problem.
There is some food for thought that follows from this reasoning also. The foundation/creation/growth of almost every nation/state (I’m sure there is some unique obscure one somewhere who can claim to be the first humans to settle their land) has involved displacing people, and almost every settled people has done so by displacing those who came before. Does this not mean almost every other past creation/perpetuation/growth of a state/nation/settled people was wrong? (Even the kurdish people settled their current territories by force, just a long, long time ago)