Now to a holiday controversy. An epic backlash over a biblical blockbuster. The director of "Exodus" is under fire for the arcs he chose to play some of the key roles. There are critics who say the cast is too white. This morning the director is speaking out. ABC's David Wright has the story. I came here to tell you that something is coming. Reporter: "Exodus of gods and kings" starring Christian bale and sigourney weaver not due out for another two weeks. After 400 years of slavery --%. Reporter: The new Moses flick is already making waves. There's a sea ahead and army behind. Reporter: Ready Scott on the defensive over criticism that the cast of his biblical blockbuster is too white. On Twitter the #boycottexodusmovie. Some tweeting since when were ancient Egyptians white? Other black and middle eastern actors only play slaves, as well. Scott tells "Variety" this was a business decision. "I can't mount a film of this budget where I have to rely on tax rebates in Spain and say that my lead actor is Mohammed so-and-so from such-and-such. I'm just not going to get it financed so the question doesn't come up" with the notable exception of omar sharif it was ever thus in Hollywood. Hollywood has a big diversity problem. They don't often let actors of color or diverse arcs play lead roles in films. Reporter: The iconic big screen Moses Charlton Heston. Who is on the lord's side? Reporter: Was no more jewish than Christian bale. Ridley Scott's "Exodus canth is in hot water with religious groups over the character Moses. He was a troubled and tumultuous man. Religious groups want to make sure the bible is portrayed in a way that is fair and isn't offensive. Reporter: "Exodus" may, indeed weather the storm. Bible epics have been huge at the box office in recent years. The controversy ahead of this one in some ways free advertising. For "Good morning America," David Wright, ABC news, new York. Yes, biblical flips usually do spark some sort of backlash which then creates a huge box office boon. Exactly in decide for yourself.