It's a lot like Judaism, from which it borrowed rather a lot of ideas, as Judaism borrowed Egyptian and Eastern ideas, and a few Assyrian and Babylonian ones.
It's about accepting (or submitting to) a doctrine which is aimed at the long-term survival and dominance of a particular faith and the tribe(s) that adopt it. Like every other religion.
Ironic that people who believe so strongly in doctrine and borrow ideas from each other, can then accuse each other of following the wrong doctrine.
But it's just a lot of words, that those in power like to wield as a form of social control and ensure their personal dominance.