You can watch this one to get an idea about their concept of a dybbuk https://www.youtube.com/watch?v=aFpn3Cv2CE4

To understand their form of "evolutionism" take this example. Judaism does not preach because it believes you are either born with a Jewish soul or you are not. Judaism is not just a belief system but also a "special" soul Jews are born with. To them only Jews are human and the difference between a Jew and a non Jew is bigger than the difference between an animal and an insect or single cell organism. But I digress.

What about those who convert into Judaism? Is it possible? Yes! They invented a loophole. If a Jew kills another Jew. After his death, his soul descends the evolutionary ladder! He goes back all the way into becoming a single cell organism or some sort of microbe or something. Makes his way into becoming a plant, then makes his way into animals, then finally into animals shaped like humans (A non Jew!) and then into an animal shaped like human who will convert back into Judaism!!!!

Only after going through the complete cycle of evolution will a seemingly non Jew go back into Judaism (They believe that particular non-Jew who converted was always a Jew and had a Jewish soul which committed the sin of killing another Jew when he had the Jewish form)

Jews were behind popularizing the current popular understanding of evolution we have. Jews are all about frameworks. About creating the frameworks others operate within.