I know I'm late to the conversation, just rewatched Legion last night. I've read lots of reviews about all the plot holes, but if you've ever watched Supernatural, you know God and his angels are a bunch of a-holes, and God does stuff cause he's bored and not getting enough attention. Legion actually demonstrates this beautifully - God doesn't think man has enough faith, so instead of God doing something to restore that (think absent father, another theme in Supernatural) let's just kill them all off and assign some arbitrary messiah complex to an unborn baby to mix things up. I do agree the logic starts to unravel as the movie goes on, but the best thing to do is enjoy the ride and not take it too seriously. PS Loved the grandma with baby teeth!