Because, I mean, this is a man who has won Academy Awards and been in like three movies a year since around 1951, to the extent that he was awarded the Screen Actors' Guild's Lifetime Achievement Award. Seriously, what is this guy doing in a movie that looks like World of Warcraft fucked My Little Pony? Are you out of money, dude? For real: We will lend you some.
Also, does the lamb character look vaguely like the retarded Matt Damon doll from Team America to anyone else?
On the other hand, maybe this film doesn't completely lack any redeeming value; after all, in this age of sin, it's understandable that kids might have a little ADD about following the Christ story -- all that crown of thorns and hand-washing is kind of challenging, like one of those weird indie flicks where half the shots are of some ginger wading into the sea and then all of a sudden somebody is holding a tiny gun and it's in black and white and you don't understand why. What you need is something relatable, like -- say! -- an awkwardly dancing chicken! And some other furry critters who say funny catch-phrases like "Unleash that freaky thang!"
It's so crazy it just might work, but for kids who weren't paying attention to the Bible version of this story, it is going to have one fucking depressing ending.