Thanks for the reply Jeff! I found information on the Book Industry Standards and Communications (BISAC) subject listings and that does help clear up a few things for me.
I think for authors of Christian speculative fiction would be interested in the following categories since agents and publishers will be talking around these categories:
FICTION / Christian / General
FICTION / Christian / Classic & Allegory
FICTION / Christian / Fantasy
FICTION / Christian / Futuristic
FICTION / Christian / Historical
FICTION / Christian / Romance
FICTION / Christian / Short Stories
FICTION / Christian / Suspense
FICTION / Christian / Western
Standard BISAC categories for Fantasy, SF, and Romance follows:
FICTION / Fantasy / General
FICTION / Fantasy / Contemporary
FICTION / Fantasy / Epic
FICTION / Fantasy / Historical
FICTION / Fantasy / Paranormal
FICTION / Fantasy / Short Stories
FICTION / Fantasy / Urban Life
FICTION / Science Fiction / General
FICTION / Science Fiction / Adventure
FICTION / Science Fiction / High Tech
FICTION / Science Fiction / Military
FICTION / Science Fiction / Short Stories
FICTION / Science Fiction / Space Opera
FICTION / Romance / General
FICTION / Romance / Adult
FICTION / Romance / Contemporary
FICTION / Romance / Fantasy
FICTION / Romance / Gothic
FICTION / Romance / Historical
FICTION / Romance / Paranormal
FICTION / Romance / Regency
FICTION / Romance / Short Stories
FICTION / Romance / Suspense
FICTION / Romance / Time Travel
FICTION / Romance / Western
From what I've found out, the Christian fiction headers are purposely general. For instance the Futuristic category not only covers End Times stories, but also science fiction. The Suspense category is general enough to have contemporary action/adventure stories as well as speculative fiction pieces. I can see where applying the secular BISAC lists might be offensive to some Christians who might bypass a God-inspired work because of how it's been categorized. While the
Screwtape Letters might be properly classified as "FICTION / Christian / Classic & Allegory", imagine the marketing disaster if it has been classified as "FICTION / Occult & Supernatural".
Still, I thing the more detailed lists could be used to further describe a manuscript in pitches to agents and publishers. Hopefully, the following references should provide fuel for more discussion.
I hope this is helpful!
References:
en.wikipedia.org/wiki/Genreen.wikipedia.org/wiki/Book_Industry_Study_Groupwww.bisg.org/what-we-do-0-100-bisac-subject-headings-list-fiction.php