And of course the TV marketing campaign doesn't disappoint with the standard plain looking guy (Gervais) lying to a beautiful woman about how the world will end if they don't have sex. Of course in a world without lies, she must oblige right? Well what the marketing campaign doesn't tell you and what I am sure has Gervais, whose comedy act often involves humor at religion's expense, smiling is what the first lie ever told was according to the movie.
The film is set in a world where there is no lying, until the character played by Ricky Gervais tells his dying mother that she will go to heaven and be with the angels, thereby inventing religion. Before that, because everyone told the total truth, religion could not exist.
So it's not only a comedy but also a work of non-fiction as well? Might be worth a look just to see the reaction when that plot line is revealed.
UPDATE: Some are now calling it the most blatantly, one-sidedly atheist movie ever released by a major studio. Sounds like a must see now.