As I have previously discussed on this blog, Angels and Demons are not necessarily male or female. In fact, the official In Nomine line is that they are neither. This decision by the developers is complicated by the fact that Steve Jackson Games uses some very gendered language when discussing Celestials in general and Superiors in particular.
So how can you do better?
Turns out, a lot of thought has been given to gender neutral equivalents for lots of terms that we use in everyday speech.