A81: Only to your class skill list as a Cleric.
So if you're cloistered, it's essentially moot because you get them anyways.
It's not moot:
Class Skills
The cloistered cleric's class skill list includes Decipher Script, Speak Language, and all Knowledge skills (from the Knowledge domain, see below). The cloistered cleric gains skill points per level equal to 6 + Int modifier (and has this number x4 at 1st level).
So if you trade it for knowledge devotion you don't get it.
I see now. I misinterpreted that. I thought he got it regardless. That's good to know.
Yeah, I felt the pinch on this one when I traded out the Knowledge Domain on my CCleric for Divine Magician, and then later wanted to be the party's "knowledge guy".
Although, even with only 1 rank (cross class), I can still do decently well with Collector of Stories + Lore of the Gods, and if I
really need to make one, I can whip out Guidance of the Avatar.