I wanted to learn more about the roots of yoga - so I "came across" hinduism.
There is a creator/creative force/god (only one - the so called gods are facets of this force which/who created and rules the universe) which/who is within and beyond everything it created - like god is the ocean, and all the things/being it created are "drops" of that ocean. So we all belong to that "ocean".
Our souls incarnate over and over again - until we have learned that we are not the body which dies, but the soul whose "house" (or "dress") the body is, and that this soul belongs to the ocean. That means: we have to learn that we (a) are soul, and (b) are - as soul - part of that "all embracing" soul ("ocean") which/who is god. As long as we identify with our body or our individual soul we have to be born again and again. As soon as we identify with the "whole", we are free from the circle of reincarnations. -- That's how I understood the concept of reincarnation in hinduisms.
I am also fascinated by the fact that there is only one creator (monothism), and the many gods are just facets of the creator. - Whereas the Christians say they are montheistic, believing in a trinity. To me god is god, the only one, and Jesus is his son. He is the same as god in the hinduistic sense (drop - ocean) - but god is the ocean, and Jesus is the drop (not a very big difference maybe, but I think you know what I mean).