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"For common monsters, such as goblins, the DC of this check equals 5 + the monster's CR."
so for common monsters with a CR of 5 or less... anyone can try the Knowledge check - even if they don't have a rank in it.
I mention this as I have seen a table of experienced players, who know as players that you need to hit skeletons with blunt weapons NOT USING blunt weapons because no one at the table had Knowledge Religion - so... a bunch of players felt constrained to try to prevent "meta-gaming"... They knew that the monsters weren't taking full damage, but restricted their PCs, because they knew what to do (as players)- they didn't do it (as PCs). The player "meta" knowledge constrained thier PCs ... If the monster had been something called a "Green Wiglet" and they had noticed it wasn't takeing full damage they would have switched to different/back up weapons to try to find the DR type. It would have been a "puzzle" they would have enjoyed solving! (I can almost hear the table talk now..."Not Silver Blunt! switching to a Magic Slashing! You got that oil applied yet? Think it might be DR/Good then?")
Heck, these were not under-equiped PCs! They all had blunt weapons! they just were afread to appear to be Meta-gaming.... One of the players had a Dwarf that often switched off from Warhammer to Battle Ax, but he was careful to use the Ax so no one would think he was "meta-gaming".