It's not about ethnicity or religion per se. The land israel occupies was taken by force from palestinians. Gaza specifically is to a large extent simply a refugee camp for those displaced to create the state of israel, and their descendants.
Both groups have, from their own perspective, a valid and exclusive claim to the land there. If not prevented from doing so, palestinians would certainly reclaim the homes and farms of their grandparents. Israel has the political, economic, and military power to prevent this, and so they do.
Both groups have, from their own perspective, a valid and exclusive claim to the land there. If not prevented from doing so, palestinians would certainly reclaim the homes and farms of their grandparents. Israel has the political, economic, and military power to prevent this, and so they do.