And now to deal with my backlog of obligations--
Take the time to visit Catholic Fiction, a handy website about exactly what it says on the tin.
The site features quite a nice collection of reviews and other articles. You might check out the article on Ross Douthat's take on Dan Brown, and the brief list of reviews sf titles, which include some notable volumes. In particular I must point you to Tannia Ortiz-Lopes's positive review of Infinite Space, Infinite God, mainly because it's co-edited by Karina Fabian, an author-editor who's had to put up with me a number of times in a number of situations.
The site is also attempting to put together a complete list of Catholic fiction in English. Good luck with that.
So go check it out. I believe the site is still quite new, but it looks like it's off to a good start.