In September 2002, I was surprised to find that there is apparently a significant market for Christian-themed movies.
Now I've learned that 2003 will see the second Christian Game Developers' Conference.
Chris Crawford was at the first conference, and apparently challenged the attendees to go beyond simply dressing up ordinary games with Christian themes.
There is also at least one company making Islamic edutainment. Have a closer look at the questions, or the last game, The Resistance. It's not uncontroversial.
(From Jesper Juul on the DiGRA mailing list.)