Just noticed the excellent argument by John Carter above that the "Christian mythology" category would be categorizing this page "up" from its present sub-category of "Abrahamic mythology". But I rather agree with what (I think) Martinevans123 said, that the two are overlapping but "Christian mythology" isn't necessarily a sub-category of "Abrahamic mythology". Christian mythology would include things like the legends of the saints in the Golden Legend and so on, would it not? Calling those "Abrahamic" seems somewhat anachronistic given how removed they are geographically and temporally from the Hebrew Bible. Furthermore, if this article discusses specifically Christian (not Jewish or Muslim) interpretations of the myth in question at any point (I'm not a topic expert and I haven't looked at the article in much detail anyway), then adding a category that befits that would be appropriate.  (聖やや)