I didn't know that the American Christian movie industry had the resources, time or know-how to make a knockoff of Finding Nemo. I guess it makes sense considering it's the religion of choice of the settler population there and is used as a cudgel to enforce "American values" or whatever.
They absolutely do have the resources but generally seeing christians spend money on something that isn't land, buildings or luxuries for the priests is pretty unusual.
Also that would put all the fish symbolism in bible pretty weird if Jesus was a fish.