All Zionists are religious nationalists.

Ever heard of Socialist Zionism? The most important branch of Zionism in the first half of the 20th Century, decidedly leftist, decidedly socialist with some collectivist elements (kibbutzim for example), often areligious while remaining culturally Jewish, and a fairly strong advocacy of Jewish-Arab cooperation in its base, at least in the 1920s and 1930s.

.....or because they were promised it by the collective world governments post WW2 as a mea culpa for how badly Jewish people were let down throughout history and during the war itself.