This disparity happens with every single movie, religious subject or not.
It is a little hard for many to believe that there was no political or religious bias interfering with their reviews when they say it is so horrible and bad, because it is so at odds with other reviewers.
Of course there was a bias by some reviewers against this film. What troubles me is that most here don't consider the religious bias affecting other reviewers into giving good reviews. Bias is in all of us. It's not a one way street.
Another way to put it, I have never seen a movie where Ebert and Roeper, or Ebert and Siskel raved so much about how good a movie was, only to have other reviewers think it was completely dreadful.
Then you might want to read more reviews because that is just flat out wrong.
Maybe you can show me an example. Has there been another movie where Ebert and his partner have both given the movie 4 stars and other reviewers have given it a one star?
One Example Of Reviews All Over the Place
By the way, This is probably a good place to investigate your question.