Honestly, don't really see the issue. The film could be good or bad, but it isn't automatically terrible because it appeals to Christians. Been plenty of brilliant pro-Christian films made in the history of cinema. And I don't even like Christianity.
I'm a huge Nicholas Cage fan... when he isn't phoning it in. He's delivered too many brilliant performances to deserve the hate he gets. The problem is that most mainstream movie-goers don't see films like Adaptation
or Raising Arizona
, so they judge him on Ghost Rider