npc clerics shouldn't grant spells to pcs of opposed alignments. Somebody that walks in with a zombie in tow, or with Malarite tattoos, probaby shouldn't be getting barkskins from Oggla, for instance.
I think that someone walking in with a Zombie is different then Someone who may be Evil Aligned. The dude with the zombie should prolly know better, and the malarite shouldn't want it. imo, this is a player-side thing, and cannot be arbitrarily masked over by giving an npx a detect alignment she doesnt need and shouldnt have..
Besides, someone could be evil -and- legitimately offer prayer to Chauntea.
Yes. Evil people like growth too.
I dont look at this as any differend than being buffed by a PC priest. Your giving coins for a buff.
Malarites, yes maybe... Necromancer with tag-along zombie, no thats lame.
Players should use good judgment and not wander into Oggla's if they are a notorious necromancer or have a zombie following them.
Not worth trying to script these kinds of restrictions.