Not actually a historian, but since nobody has commented yet, I'll have a go at this question :)

Are you familiar with the theology of dispensationalism? It's considered heretical by the Catholic and Orthodox churches, but a fundamental aspect of the faith of (at least some, not sure if all) Evangelicals. Basically they believe it's necessary for Israel to exist because if not all Jews are in the holy land, Jesus won't return. Also, in case they don't become Christian, they will be destroyed then.