I was watching Paranormal State last night while I wrote, and they were going to help a couple who were ultra-Christian. I think that's where I got the idea. It was pretty funny - the director gave the team a little speech on being considerate of the clients' beliefs and avoiding overt displays of their own religious views, (since they need the clients' co-operation to to their investigation). It included "so Heather, we shouldn't let them know you are pagan. No cauldrons or weird shit on this trip, okay?"

Cracked me up.

As for Slayer of Christians - that's more a Rome fanfic, I think. :)