Aside from the Biblical stuff, which I believe and agree with, Israel is a lonesome oasis of human rights and freedom in a region of oppression and tyranny. Not the sort of oppression that various groups whine about in the United States, the actual, stoning-gays-and-mutilating-people, honest to God oppression. Every other country region fervently believes that their religion demands the extermination of the Jews, yet some moral relativists still manage to find a way to think these terrorists are the good guys.
We don't even need to justify strong support for Israel on religious grounds; by any objective measure, Israel's continued existence is in our national best interest.