The Dark Lord's People's Movement
For years after the second great flood, those evil despots and their petty superstitions of Satan's great power have oppressed us and forced their false god on us. Because we know better of their evil attempts at brainwashing the masses, we (the people) will kill all who stand in our path at making a state dedicated to the dark lord!
For a more factual explanation, global warming goes unchecked and completely melts all large patches of ice and snow on earth, leaving sea levels considerably higher than in OTL. Many, many years have passed (possibly hundreds or thousands) since this catastrophe and societies are considerably more zealous seeing as people have lost faith in their governments and instead have put their trust in religion.
Because of this, the lines have blurred between secular and religious ideologies, making ordinary people and reborn nations left after these floods superstitious of revolutionary movements because they may overthrow any theocracy in place, which are surprisingly common after the apocalypse in this timeline.
Being secular ideologies, the lines between socialism/communism and cults against organized religion (satanism, paganism, etc.) have also been blurred, leaving people that would associate themselves with socialist movements in OTL as satanists and anti-christians.
Wow, how ASBish.
