Why is it that...

Why is it that...Christian films have a few professional actors but will inevitably use amateurs who look like they know they are being directed? You know, the "actors" who appear mindless and say their lines with a blank stare... 

...while Hollywood, when depicting a Biblical theme, always throw in a lot of really stupid nonsense.

I'm hoping Ridley Scott's Exodus: Gods and Kings won't include aliens.