This issue crops up throughout the beta playtest booklet but it's particularly pronounced in the cleric class given that most domain powers are spell-like abilities.
A spell-like ability has no verbal, somatic, or material component, nor does it require a focus or have an XP cost. The user activates it mentally. Armor never affects a spell-like ability’s use, even if the ability resembles an arcane spell with a somatic component.
This sentence has been removed from the pathfinder RPG but to those familiar with 3.5 it would seem that in a round about way all domain spells, 0 level spells, and many class abilities are now stilled, silent, eschewed materials, and free of exp cost. However for some reason they still provoke attacks of oppertunity.
I think It would be of benefit to clairify the verbal, somatic, and material component costs in pathfinder RPG, I suspect the intention was that spell-like abilities mirror components of the actuall spells upon which they are based.
In any event it should be spelled out.