Zionism is a political view; a Zionist can be from anywhere just as a socialist can. Jews are indigenous to Judea though.

Others have a right to live in the region too, hence proposals to share the land, such as the partition plan or the 2000 Camp David offer.

Judaism is a religion. Jews are from all over the place. Almost none from Palestine.

"Judaism" sometimes refers to the religion, but many Jews are not religious. Jews are a group of people from Judea, hence its historical name. Some dispersion to other regions doesn't change where a group of people is from.

Judea does not exist. If you’re talking about Palestine, very few Jews are from there pre-dating Zionist invasion.