Well, I'm certainly alienated as a student of philosophy. But I also inherited an existential perspective from my Judaism.

For most of their history, Jews have been famously existential, satirical, and practical (like in Ecclesiastes), as opposed to being highly theological and dogmatic. That's owing, I think, to their history of suffering. Why have they been persecuted? Because they're different, meaning they hold themselves at a distance from foreign societies, protecting their cultural identity. So it's not a stretch to think an alienated people would seek comfort in a symbol that encompasses that alienation, such as in a deity that's uniquely absent from the world. The God of Judaism transcends nature not just metaphysically but morally.

Sure, the esoteric traditions of each of these religions speculates about ways of accessing God, and so on. I'm talking more about what distinguishes the exoteric, mainstream traditions.