Anything Worth Dying For doesn't necessarily have fangirls, but there are "excerpts" from the Book of Chuck, that the author treats like a valid religious text. They guys also lead an army recruited from hunters, angels and other supernatural creatures. Dean/Cas (Bottom Dean) http://waldorph.dreamwidth.org/235461.html
Dead Soldiers: A History of the End of Times (gen) http://girl-wonder.livejournal.com/207202.html, it's written like a oral history text, it's pretty interesting.