And in this case, yes, a lot of the lore and story of this game does exist independently of the players.
The way a player can interact with the game world is limited because it's a computer game, but not whether or not it makes sense for Wyll to take levels in paladin. If it's allowed and I choose to do it, then by definition it makes sense in my game, even if it seems silly to you. Everything in the game is pretend, including whether or not Wylll's patron is a deity. Nothing and no one can stop me from saying to myself, again assuming I can multi-class Wyll as a paladin, that Wyll's patron is a deity. Because I am the co-DM of my own BG3 game. That is head canon.
We have reached the "agree to disagree" stage in this discussion.
