Doom Movie Query

So there I am watching the Doom Movie in Insane Quality and I have a question.

Why didn't they just do a story about some scientist opening a hellgate and demons taking over the Mars research facility?

On one hand America is a very religious country and doesn't like anything that is seen to be a subversive occult influence on the population like Harry Potter or Dungeons & Dragons, but it would have made it a better film and I don't believe that the outrage would hurt sales at all. Infact I think it would help a great deal, so why the crap about the human genome!?