Undead can pray
The player can be sacrificed by undead, which doesn't make sense
Several undead creatures can pray to gods and sacrifice the player. Possibly all of them, but at least skeletons, shadow centipedes and ghost bats. This doesn't make sense for several reasons: Firstly, the player cannot sacrifice them and they don't have (normal) minds, indicating that they can't have a relationship with a god. Secondly, several undead shouldn't be able to talk at all due to their lack of necessary organs or being animal ghosts.
I suspect there's a flag for undead creatures that's supposed to make them unable to pray, but isn't working as expected and does the opposite instead (making them all able to pray).