I think you need to understand that nobody here is provoked by this and people are genuinely trying to help you understand what you are asking about. Because you come off as attempting to be an edgy troll and failing miserably.

Arguably they didn't. The modern trappings of Christianity were invented out of the whole cloth from Paul of Tarsus, when he had a "vision" of Jesus conveniently not seen by anyone else purportedly while he was traveling on the road to Damascus. Notably, all of this went down some decades after big J's death.

It was Paul who discarded the bulk of the Jewish stuff, either out of desire to make it more palatable to his Roman peers or, possibly, simply because he was a raving nut. Paul was a self-described persecutor of the existing Christians, so he would have been in a pretty good position to know what their beliefs were to use as a starting point.