Hard Science Fiction or Space Opera, Cyberpunk or post-nuclear, this is the realm of Science Fiction.
The Role Playing Game Workshop: Read. Post. Play."/>
The multiple-worlds theory of cosmology allows room for every religion's Heaven and Hell and other planes to coexist, with the similar planes of all the sapient beings of all the worlds in all the galaxies...How often do the wires get crossed, as it were, leaving your paladin in a Hell for hedonistic lizards, for example.