USC. It's not an official requirement written in stone or anything. It's more like - if you want to get decent evaluations and hence, keep your job, god has to get some kind of attention. For example, my evals one semester were super wretched with comments like 'she's an atheist and makes us feel stupid if we aren't." My first reaction: yeah, and? But then again, if I ignore Aquinas, Descartes, etc, entirely, not only do I omit a huge amount of historical material (all of which can be adequately refuted anyways), but I get this kind of slander and my job is threatened.