I mentioned in the comments section of The Good Robot that I’m not so much writing religious science fiction as writing science fiction with certain religious and spiritual elements. The distinction is important. Except for some noteworthy exceptions, religious science fiction, such as Christian science fiction or Jewish science fiction, will appeal to only a limited audience.
Of course, the same can be said of science fiction in general, but the number of people who will read the latter is probably much larger than those who would read the former.
That said, sources such as Amazon and Wikipedia highlight a great number of science fiction stories that leverage religious themes, but these are sometimes fictional religions rather than ones we are aware of in our world, or very fictionalized versions of religions we’re familiar with in our lives.
I came across an interview with Orson Scott Card at Writing-World.com that reminded me that in most fiction, including science fiction, religious people and religion (specifically Christianity and Judaism) are depicted in unfavorable ways.