This doesn't exactly sound like an "atheist movie" as in an attempt to evangelize and convert people to atheism from the summary:
The article is based more on that it has an atheist hero who is portrayed positively, which is different. Not exactly the first such movie either. Nor are any of the cast members outspoken atheists or anything like that. Just the media in search of a story.
For a real atheist movie, look to that Bill Maher documentary Religulous from 2008, which was pretty entertaining but also kind of preachy and thus hypocritical as a result.