I've been on a quest to find reasonable, varied perspectives on the issue of whether a church should protect itself with guns, extending even to individual self-defense issues. I think I found something really intriguing. Below are links to a documentary (linked to a book of the same title) called "Shooting Back" (broken up into five parts on YouTube), about a Christian guy who shot back at terrorists during an attack on a church in South Africa in 1993, an event that is known as the St. James Massacre.
This guy brings up some very powerful, interesting, enlightening, and controversial arguments supporting guns. I really urge you to watch it, digest it, and feel free to drop some comments on your thoughts. I think he makes some great arguments, and I think some things he says are a bit dicey.
Let me know what you think!!
(and if you're REALLY up to it, here's a link to a very, very thorough scriptural examination/interpretation of Christianity and self defense)