Interesting article on io9.com, a website devoted to science fiction:
Christian readers demand more science fiction books. Why won't Christian publishers listen?
As a Christian who reads and writes science fiction, it is a bit of a puzzle. On the other hand, my very secular, small press editor for my novels Antediluvian, Somewhen Obscurely, and Inheritance had no problem with the Christian and religious elements in my stories. So even if Christian publishers won't handle science fiction, there are plenty of mainstream publishers who don't mind Christian or religious themed science fiction. For instance, religion plays a role in many of Robert J. Sawyer's novels. His publisher is Tor, one of the biggest names in science fiction publishing. His novel, Calculating God, is a fascinating book. I don't know his personal beliefs, but his novels nevertheless do not fear to examine seriously a variety of theological and religious topics.