I don't think starting as a paladin makes any sense for a dark urge character. This person doesn't remember anything, has a terrible past, but somehow carries the power of a vow with no memory of having made the vow? This kind of approach is dead on arrival, imo.
Doesn't this apply to at least half of the classes?
How can the amnesiac remember being a priest(ess) - and of what Diety, his or her patron - if warlock, etc.
And some of the mess with Paladins in BG3 can be laid at 5ed's door.
IMO it is impossible to play a Durge and be a Cleric or Paladin of a Neutral or Good Diety and not "fall". In tabletop you'd be deprived of your divine given powers very quickly. But in BG3 - Cleric of e.g. Ilmater or Lathander for Durge - no problem ...