I've been wanting to simplify the general pantheon of 5th Edition down to 2 major moral forces, mirroring the horizontal spectrum of the alignment system:
(Good [Neutral] Evil)
It seems simple enough, right?
The only major implications that I've come up with right off the bat are, ultimately:
All Warlocks are Evil (Satan must be their patron).
All non-Oathbreaker Paladins and non-Death Clerics are Good (God must be their God).
Is there anything else that I may have overlooked that would have a large effect on the game should these effects go in place? I enjoy the implications of this dichotomy and would love to see if there are even more curious effects on the D&D universe.
Best Answer
This is not homebrew.
Quite the opposite, the Dungeon Master's Guide mentions dualism as a valid religious system, see page 11, "Other Religious Systems", emphasis mine:
See DMG page 12, "Dualism" for more details. Alignment isn't tied to gods in this case, but serves as kind of a moral compass for a character. It might still be the standard nine alignments.
Also, regardless of the fact that there is one single God, Clerics still have to choose a domain: