Okay, i made a crappy quick image for some temple. This is Govannon or Ogma, as it has the shape of a helmet. (Ogma's Orc Helmet, Govannon = god blacksmith).In this example i'll use Ogma cuz it's faster to type ;P.
In the center is the altar of the god Ogma. Left is the 2nd God's Creature. Only a select few can pray to Ogma, the high priests. The selection depends on level or amount of praying. If you change gods/start praying to Ogma, you first pray to the 2nd God's Creature. It will grant you the ability to bless to, ehm, what's Ogma's thing? Oh yeah, Giant and Goblin (cuz those are gov's enemies
). Well, you first bless to Goblin. With Goblin you only have the ability "Slay Faery". After you, let's say, blessed 5 weapons, or prayed a long long time, you can pray to Giants. Giants add the ability "Slay Dwarf". After you blessed 10 weapons, have a certain wisdom level requirement (depends on every god), you can bless to Ogma himself. Now your sword poisons, and is of Ogma. This will make blessed weapon a lot more special.
Also, the temples should contain statues etc