The current variety of Christian fiction is illustrated pretty well in the Library Journal's list of the year's five best.
There's an Amish romance, though the review calls it a "fresh take on an overcrowded genre," two historical romances', one set in Tudor times and the other on the Titanic, a Christian horror novel, and an apocalyptic/CIA novel.
That might still seem rather limited -- Christian fiction authors of more speculative works, such as sci fi and horror, certain complain about the constraints of the market -- but it was only a decade ago that an organization with a name like American Christian Fiction Writers only served romance novelists.
Another year-end list, from a LifeWays Christian Stores' book buyer, shows the variety to be found even in what is still, broadly speaking, the romance genre. via Carole.