Wether or not, I would think taking the keep first would make sense. It's the greatest obstacle after all. And we have the keys to the church, so unless the villagers reinforce the church grounds extremely quickly, we should be able to just walk in. If we even need to, since they most likely would not be able to flee with much of their foodstores, we could do as the more devout memvers of the cult wanted and just lock them in, leaving them to starve or eat eachother.