I spent some of my college years studying with the Jesuits, which inevitably led to theology classes and the fascinating history of religion. That class is summarized in this new version of a great graphic by Simon E. Davies, a complex tree of myths and traditions continuously evolving into remakes.
Even while the dates are approximate—many of these religions started before written records—this is how most religion historians agree that it all happened. It's quite fun to listen to the Jesuits themselves explain how modern Christianity is nothing but a rebooted version of Judaism mashed up with some new tales and the old Roman and Greek polytheistic traditions.
Ultimately, the lesson here is that high priests of every religion through the ages have been nothing more than unimaginative Hollywood movie producers with a taste for derivative material.
You can buy the poster here.