So, anyway. I treat religion like I treat comic books - and their films.
The polytheistic religions are Marvel Avengers, Justice League, League of Extraordinary Gentlemen and so on. A whole bunch of guys with different superpowers and jobs to do, with one of them being a bit more leadery than the others.
The three main monotheistic religions are three film adaptations of a single comic book hero - like the 1977 "The Amazing Spider-Man", the 2002 "Spider-Man" and the 2012 "The Amazing Spider-Man". Each tells basically the same story arc about the same super-powered character, but they differ somewhat in the details and supporting cast.
Of course comic books also have their own implausible origin stories, some kooky ideas about space and time, a very vague understanding of science (often skipping it altogether in order to maintain a narrative) and some improbable death/resurrection scenarios - their reality is often very bizarre and doesn't reflect our own. Or was that religions? I forget.
The common ground between Judaism ("Monotheism 1: The Birth of Monotheism"), Christianity ("Monotheism 2: Son of Monotheism") and Islam ("Monotheism 3: The Final Cut") is astonishing. The common ground between Judaism and Islam is even more astonishing - they have a significant bulk of similar practices, beliefs and laws that Christianity dispenses with - given how often the two groups come into conflict with one another. But then I suppose I shouldn't be surprised given how often Protestant and Catholic Christians find reason to come into conflict - or Sunni and Shi'a Muslims do - despite sharing the majority of practices, beliefs and laws...