This letter is written to the church--a church that apparently has some scared people in it. The advice, "When you think demons are after you, depend on God for your protection."
The modern-day application that came to me today was the debate we Americans are having over our government's role in health care.
As the faith community considers how best all can receive whatever help they need, can we not use the metaphors in this passage?
belt of truth
breastplate of righteousness (note, not self-righteousness)
shoes (so you'll be ready to step out and spread the good news)
shield and helmet (there's a lot of folks that will be shooting arrows at you)
And not metaphorical at all, prayer.