God, Court Martials, and JAG

Lately, during discipleship class my students have been discussing the topic of freedom. Today, specifically, they were discussing free will (insert: My boss, Bruce, is a very brave man!!!). Anyway, hilarity ensued (or something akin to it) when one of my students claimed that following God was like joining the Navy:

"Yes, you get the benefits but, once you're in... you're in. And if you leave you get court martialed, and JAG steps in, and it's all down hill from there!"