Given that there's 6 or 9 dedicated religious people out there, the mod has plenty of room to avoid hitting any innocents.
As for the chance of a double role.. it depends. My original style encouraged it (even to the point of all of the townies being the same power role). You can go crazy with the townie powers here since we're mostly made to be cover for the religions as well as a feeding ground.
Meanwhile, people keep wishing to join the biggest group'. However, none of them are bigger than the other at the moment and there's either 2 or 3 of them around. 1/3 chance of getting converted into the losing religion and, even if you do join the right now, you still have 2 zealots and a possible merc gunning for you. As such, while I don't hate the religious groups overall, I'm content to let them duke it out and to leave me out of it.
As for the vote on Pan, the 'if you were religious' question gave him the option of converting or killing. He chose to kill. Even in choosing to kill, he opted to choose killing converts (aka, ex Townies) instead of killing the main worshipers.
Given that, I believe he's accidentally telegraphed his role. There's at least 2 killing roles here, possibly more, and, while they would have no reason to go after a townie NOW, once the converts start they may get trigger happy.
A question, Pan. Why do you feel that killing is the better option for the Religious than converting?