It sounds like your group, or you specifically, is very hostile to the team play environment.
I'm not going to tell you your wrongbadfun is wrong, and if the players are cool with you always playing deceitful, thieving 1st-edition style thieves, that's great... so long as you're not attached to the character.
I could easily argue the opposite. What you are describing implies that no evil society could possibly exist, hence... bad guys. In your world, they would never work in conjunction with one another.
Working together for different goals is the very stuff of role playing. Any experienced player can tell you that. How else would thieves play for decades in AD&D? And they were required to be evil too. And they worked along side paladins.
2. The rules are not that clear to me. Looking at more core rulebook, I see "wave of energy", "burst", etc. There's nothing that says that it's invisible, odorless, soundless, or isn't triggered by using the holy symbol in conjunction with a prayer (verbal component) for example. A quick scan of UM, the APG, and the Paizo boards didn't reveal a set interpretation either. If there is one, please direct me to the source.
If there is one thing I've noticed about Pathfinder, it is extremely precise about the details of any ability or effect.
The rules are extremely clear in this case. "
A cleric must be able to present her holy symbol to use this ability." The victims suffer the consequences of a failed save.
If you wish to add or require more, that is your choice but it is house ruling.
There's no reason not to simply follow the rules and have the cleric of Norgorber will the living to die.
However, I personally prefer more descriptive narratives in my game. Our existing cleric of Sarenrae yells, "Back to the hell from whence you came!", and the undead are visibly blasted back. I dunno, it seemed a cool idea at the time.
I believe that the size and shape of the holy symbol needs to weigh into this. It would seem a bit trite to make it mini. Norgorber is a black mask with a star on it.
Calistra is looking a lot easier to use now. (No... he wouldn't be a nice kind of cleric. Negotiating bulk discounts in brothels would be right up his alley.)