Somthing to consider...

Said one demon to another: “One of our great allies at present is the church itself. Do not misunderstand me. I do not mean the Church as we see her spread out through all time and space and rooted in eternity, terrible as an army with banners. That, I confess, is a spectacle which makes our boldest tempters uneasy. But fortunately it is quite invisible to these humans.” (from C. S. Lewis’ Screwtape Letters, cited in Alan Jacobs, The Narnian, 217)