It is not offensive to me as an atheist, it just looks really stupid. At least when they use ancient myths it kind of makes sense to turn them into action movies, because their heros tended to be monster-slaying ass kickers, but Noah? If anything this should be offensive to Christians 
"Mozes: Escape from Egypt" based on a true story.
You know the scene to watch.
"This is Mozes Actual?"
"Requesting Frogs, Hailstorm and death of first born, how copy"
"Roger that Mozes actual, this is God, sending it now"
"Also be advised splitting stick is dropping now, out"
It will be great!
