incognito said:
Besides the obvious roleplaying reason, it there any mechanics reason to take Know (Religion)? I am seeing too many Clerics L7+ with only a token 1 or 2 ranks
Roleplaying reasons are fair enough.
Some situations:
A Clr 7 of Selûne with one rank of K[R] encounters a dark-clad woman with a black disk with deep purple border on her garments. The woman stands him a drink. 5 minutes later, the Selûnite finds himself on the fugue plane.
With only one rank in K[R], combined with the Clerics only average Intelligence, it's quite possible he doesn't even know who his church's enemies are.
Or a Clr 7 of Kelemvor whith one rank is asked to speak a final prayer for a dying old man. He says he doesn't have time for this and they shall bugger off. He wonders why a couple of days later, he's thrown out of church, can't cast spells any more, and everyone shuns him.
With only one rank, you probably doesn't even know what your church does.
A DM should tell his players that Knowledge[Religion] is very important to a cleric, and that they need more than just a token rank to know all the services they must perform, and all they have to know about their religion, and on other religions as well.
If I were DM and had a player with to little ranks of Knowledge[Religion] (say, less than max Rank/2), I'd start to punish them for bad Roleplaying. (I'm so happy that you can't have illiterate wizards any more)