So, God is the bad guy in this movie? Weird. I assumed the title "Legion" was referring to the man that Jesus cast the huge posse of demons out of. When Jesus asked the man who he was, the demons inside him responded "My name is Legion, for we are many." Creepy. A man possessed by 7+ demons that no one could handle--now that would be a killer concept for a film.
Also, when God lost faith in humanity the first time, and sent the great flood, there was still hope. Noah was faithful, built the ark like God said he should, and humanity survived. I hope there is some element of God-sent hope apparent in "Legion". Otherwise, the plot is completely out of character for the God (Yahweh) that a large percentage of movie goers worship (namely Jews, Catholic Christians and Protestant Christians).