Wow, Kim. I've been reading this thread with much intrigue.
I'm not a christian. Quite the opposite, in fact. Unlike you, I was indoctrinated, as a child, in all things fundie-christian and quickly ran to the hills away from such. However, like you, I've also studied religion - both in terms of academia and also in relation to some of the heresies over the years, such as gnosticism. My BEd disertation was in the relationship between christianity and the occult and, with the likes of gnosticism, we have such a marriage incarnate.
Anyway, my own horror manuscript 'Drop Dead Gorgeous' would feature a number of religious folk in post-apocalyptic Northern Ireland, amongst all the other disparate characters. Their ongoing fervour (perhaps heightened) despite 99% of the world falling dead, is quite interesting.
In short, my novel may well be in contrast to yours in term of its religious flavour. The small crucifix which passes between several characters in the book would chart more the destruction of faith, hope and love in the post-apocalyptic world rather than the embracing of such...