I've been thinking about this lately, and was hoping for some external input. I am currently a theology/classical civilizations/ancient Greek major in college, hoping to go specifically into the field of early Christian studies with the intent to eventually teach. I attend a Jesuit University, and the graduate programs I am looking into are all Catholic. My own religious affiliation is Lutheran. I participate and lead in ecumenical worship on campus, and am dating a beautifully-religious Catholic. My own research interests are in theosis and Christian mysticism within context of Christian history, and I also interested in the history and development of Christian narrative as a spiritual tool (i.e. Augustine's Confessions, Thomas Merton's Seven Storey Mountain, ect...).
I short, my goal is to become a teacher and writer in these subjects within the context of church history. A friend of mine, who is a Jesuit, told me the other day that Catholic high schools are not allowed to hire theology instructors who are not Catholic, even though the instructors they are forced to hire sometimes are not theological trained, not even to the level of a B.A. Is it not possible to teach theology at a high school when not Catholic, even if one is Catholic-taught and teaching in a field such as church history? I know that it is not an issue at most Catholic Universities, nor is it an issue for Departments of Religious Studies, but my question is specifically for high school, in the event that I feel as though my calling is to teach high schoolers and not university students.