Faith is a powerful motivator. Provided it is guided and fueled with the right intent and passion it can affect all those around you. But people of faith might be so focused that they are easily manipulated and that, on the surface, is what Katrin Gebbe sets to show us with her debut feature. From the very first frame, even considering the title of the film, it’s an absolute certainty that this affair will end in misery but what makes the events depicted even more gruesome is that they actually happened. Gebbe’s film is based on true events and once you start this ride, well, a quote from Lena Headey in…