Larryc, the problem is too knotty for any academic association to untie with a set of guidelines. While I really wish that the American Academy of Religion would issue guidelines, it won't.
Community colleges in particular, but also colleges with no official department of religion, tend to hire folks with theological degrees or even degrees in philosophy to teach classes in religion. They do this because they don't know any better.
These MDiv and ThM-holding folks are not trained at all in the discipline, and frankly, they most often work at cross-purposes to the discipline. It makes me crazy. When at my last institution, which had three two-year satellite campuses, my department (of religion, of course) constantly had to intervene in hiring practices at the satellite campuses. Deans would regularly hire local ministers to teach classes in religion -- not just Christianity, but RELIGION. I spent ten years trying to educate deans about my discipline, and took on extra classes on the satellite campuses just to model disciplinary integrity for those folks. I sent a cadre of MA-holding grad students trained in my discipline over to those campuses as adjuncts. But if my former colleagues let up one bit, those CC deans will hire ministers again. In a heartbeat.
Yikes.