The attitude to dead people
Naturally the attitude to the dead person was also ambivalent. On one hand the dead person was honoured as the ancestor and on the other hand he/she was considered to be the harmful body and spirit that lives near live people.
And all mythologies of the world mentioned the creatures that rose from death and were the living dead that came from the grave and attacked people bringing diseases and death. The stories about vampires that drink blood and bring the disgusting to the world were present almost in all nations of the world they were simply named differently.
People tried to kill the living dead and to scare harmful creatures tangling the road to the world of live people. But the best way of damaging the harmful effect of the dead person is to send the dead person to the other world.
Some tribes with not so developed civilization didn't have the differential mythological ideas about the other world. So, Australians believed that the dead people populated the desert areas, forests and bushes, came into the sea, etc. Sometimes people knew only about the direction in which the dead person went away.
People didn't know much about the hobbies of dead people and their occupation in the other world, as the majority of people thought they simply had the ordinary life of the hunters.
And the duality that was reflected in the desire to send him/her to the other world and to keep him/her in the society led to the creation of belief according to which the human being is divided into two parts that make the soul and the body.