Paradise was an invention of the Egyptians later adopted by some of the Greeks, they called Elysian or Elysian Fields. The Egyptians called it the Field of Reeds.
In Egypt the dead body or a version of the persons spirit (there was a total of 3) would travel to the underworld while its KA spirit would go out.
In the underworld it would go through triles or tribulations then be judged against the heart of MAat. If it's heart was pure it would rejoin its spirit and all its other parts and move on to paradise. If the heart was not pure it would be eaten by a animal demon god and the body would be cast off in to the lake of fire.
Christianity is a copy of these ideas including thier Astro theology.