I cannot remember the exact quote, but Satan once remarked to St. Anthony the Great, something to the effect, that he was once at peace in the desert. Now Anthony has filled it with monks! To understand the Devil's complaint, you would need to know that the monk's very purpose for being there was combat. Those monks were aggressors traveling into the desert to battle the Devil. Of course, "Aggressor" should be the disposition of all Christians against the kingdom of darkness.
This anecdote has me wondering what the Devil thinks about Catholic parishes dotting the surface of the globe. Does the Devil bemoan the founding of a parish and rejoice at the closing of a church? Of course. Could parishes do more to be centers of spiritual warfare? Of course, again!
Here are seven powerful and easy ways a parish could become an effective aggressor in spiritual warfare and drive the Devil away: