You mean Judiasm? That's all old testament, with Revelations thrown in. It's possibly the most insular religion in the world, with a focus on the genetic barrier between us/them.
The abrahamic religions have a tendency to dehumanize their enemies (everyone that's not them, lol), and it's probably rooted in monotheism.
Christians seem to think they are all the Christ, which isn't so bad when they actually read NT.