Actually we have a bit of a conundrum regarding faith and the Rampires.
We have  
in Grave Peril 
vs
in Changes.
No, I think it makes sense. It's just that, while Red Court vamps 
are one of the groups which are strongly affected by implements of faith, Blampires are even 
more strongly affected by them. Red Court can be hurt and turned away by them at a distance, but Blampires can be 
fried by them even at a distance. At least, that's how it seemed to me in 
Grave Peril and 
Blood Rites. Which makes a kind of sense: Red Court are unnatural, soulless monsters; Black Court are even more unnatural, soulless, undead monsters. Red Court have a kind of magic flowing through them, maintaining their presence on the mortal plane; Black Court have a kind of magic flowing through them, which they not only need to maintain their presence on Earth, but also to simply animate their own bodies. They rely on it more than the Red Court does, so if something like faith magic interferes with it, they go poof faster.
Which is not to say that the Red Court isn't harmed by faith magic more easily than most beings of the Nevernever-- which, apparently, they are. It's just that Blampires have it even worse. But then, Blampires are also much more powerful, too.