I agree with most of these reasons. Part of it is also that Christianity is a minority in a mostly atheist world and a culture that is highly hostile to Christianity, so most of the talent in any given industry is in the secular rather than the Christian.
For the record, though, there is a company called Digital Praise that has made a couple adventure games that weren't bad, but their main achievements are two games based on (meaning almost identical to) Dance Dance Revolution and Guitar Hero. Though imperfect, they are very good clones of their respective inspirations, but with Christian music. Which is nice, since there is actually a lot of really good music out there by Christian bands, and only a few songs in secular rhythm games are from any of them (FlyLeaf's "I'm So Sick" being the only one that comes to mind). Worth checking out if you're a fan of bands like Red, Thousand-Foot Krutch, or Stellar Kart. Though Dance Praise suffers from far too many praise/worship songs... David Crowder just is not fun to dance to.
EDIT: I would like to point out that there are plenty of stories from the Old Testament that would make great games, but unfortunately the violence in them would only feed the ignorance that inspires people to claim modern Christianity as a religion of violence. It would be awesome, but it would not be a good idea.
For the record, though, there is a company called Digital Praise that has made a couple adventure games that weren't bad, but their main achievements are two games based on (meaning almost identical to) Dance Dance Revolution and Guitar Hero. Though imperfect, they are very good clones of their respective inspirations, but with Christian music. Which is nice, since there is actually a lot of really good music out there by Christian bands, and only a few songs in secular rhythm games are from any of them (FlyLeaf's "I'm So Sick" being the only one that comes to mind). Worth checking out if you're a fan of bands like Red, Thousand-Foot Krutch, or Stellar Kart. Though Dance Praise suffers from far too many praise/worship songs... David Crowder just is not fun to dance to.
EDIT: I would like to point out that there are plenty of stories from the Old Testament that would make great games, but unfortunately the violence in them would only feed the ignorance that inspires people to claim modern Christianity as a religion of violence. It would be awesome, but it would not be a good idea.