Here's something i thought:
Inside of the purgatory there's Limbo, limbo contains all the different "heavens" and "hells" of other religions since greek, northern and Egyptian gods exist
I'm pretty sure Bossfights isn't technically christian.
I mean God exists but i imagine him as like, a being above all that none can reach him, a true God.
The other gods are just immortal beings called gods to differentiate them
Note: "Escape from Hell" (or at least my version) takes place in the underworld, despite the name of the story, and the name will not be changed, because the name "Escape from the Underworld" doesn't sound as cool.
Heaven; For those who are righteous and loyal to the Lord; Reality; For the living, to live the test of life. Purgatory; A temporary realm for the righteous to be cleansed of their sins before entering Heaven; Underworld; For those who are not wicked, but did not follow the path of the Lord. Hell; For the wicked and evil, and those who the Lord never knew.