The origins of Christianity can be found in ancient Egypt where there was a great contrast between the people who had money (the priests and politicians) and those who didn’t. They had a longing for blessed immortality beyond the grave so they invented an afterlife where the entrance into the afterlife was based on how well a person practiced their religion, not how good they were.
In Memphis, Egypt, the story of creation involved God taking his sexual organ in his right hand and masturbated. His semen fell to the ground and life was given to the Earth.
Isis married Osiris and they gave birth to Horus, too.