I for one, was hoping this would turn into the "Exorcist meets the Devils", but sadly, it didnt. That said, I still enjoyed it, because Ms Arterton is so highly watchable. I am not sure exactly what it was SUPPOSED to be about, but as committed atheist, I have my own views, not least that missionary work is a plague on humanity, and that a safety rail salesman would have cleaned up, but why this and other missions failed is not really explained, probably because there really isnt an explanation