Will smith has in the past repeatedly denied that his friendship with Tom Cruise means he's a Scientologist. Yet, the movie that carries very much of himself in it from writing to producing and acting is claimed to show notable similarities to Hubbard's teachings. If so, it would be a bit more subtle than Battlefield Earth, and possibly much more questionable.

http://www.hollywoodreporter.com/news/a-sciento…

I am not an expert in this, but I think it's worth noting, especially with many of the things that I heard people finding weird and confusing about it (like Smith's character's lack of emotion) actually would mace sense in that context...