Well, they have 3 otherworlders at their disposal, we don't know much about them yet. They have the Church also joining in with the plan (with some dude with a secret art), and their plan relies on more joining in after orchestrating an event that will give them an excuse for a righteous war.
As for Milim, she was at Clayman's castle at the end of the episode, and we know how good he's at manipulating and controlling.