Sorry but how much God is involved in his cleric activity is very much different than alignment. If a divine is devoted to bring anti-undead but one of his clerics still getting sprlls etc is walking around with his train of undead followers, that creates an entirely different aspect to the world, not just a difference in his player's head. That's different from a character and a player just doing stuff.
And again, you isolate it down to one player, but there usually are others at the table. There are others who also have to consider the world.
As I have stated, in my games, my players enjoy having a consistent world where they can expect things to run along a set of normal predictable patterns *plus* a good deal of the fantastic. It's not "realism" we prefer but consistency and integrity from the setting. The more we played in systems eith gimmick meta-eraser mechanics the less enjoyment we had. So, for us, the unreasonableness of the trex not getting serious issues in town or only being able to steal some bikes but not others for no reason beyond GM fiat and one village skipped over but another razed to avoid messing up...
Those are not things I would ask the other players to sacrifice or be happy with seeing them getting less fun out of our games just to accommodate one player who prefers the game to be run differently - and so if someone says my game is not for them, that's great cuz I do not try and make my game please everybody.