Jewish, Christian and later Muslim Palestinians lived alongside each other for nearly two thousand years between Bar Kokhba and the rise of Zionism in the late 1800s. Many conflicts between local elite factions, some violent, but almost never religious in nature unless involving foreign intervention.

Modern fundamentalism is what forever-war does to society.

Happily forever-war is normally self-limiting via bankruptcy and subsequent reassessment of goals - but Israel is the world's largest foreign aid welfare recipient. The more crimes their govt commits, the more enemies the create, the more debt that gets printed and forwarded to them to spend.

Incentives. Incentives all the way down...