I think an atheist will never able to understand WHY
I believe in God, how real God is to
me, and how assured & blessed my life is to have a relationship with the maker of Heaven and Earth as my father, confidant & friend! the same way I will never understand why an atheist doesn't believe, how he can not see God & His works in everything and everyday..
and if you put the two of us in the same room to debate whether or not God truely exists, we'd have to agree to disagree. He will never be able to convince me that God doesn't exist - no matter if he shows me movies, or books, or whatever.. , and I will not able to convince him that God does exist (because only God can do so
).
But, if the movie aims at children, it's a little bit different - and I think that's why some Christians are concerned - because most of the time, children believes what they're told. Younger kids may not be able to distinguish between fiction & real life, and may take the message from the movie as true lesson. But whatever they do, it's only to voice a concern - the responsiblity to foster the kids faith, teach them truth from lies lies on the parents' shoulders.