Is this a case where she was fired because the book didn’t have anything to do with the class she’s teaching? Or because a bunch of parents went Karen and it made the school district look bad?
If a history class references passages from the bible, I think that is inappropriate in general but it depends on context. If it’s using the bible to explain say the history of the Holy War, that makes sense. Having the context about the why does help.
If she was teaching Sex Ed and talking about gender fluidity, in that context it makes sense to me.
Like you can’t talk about Hitler’s philosophies without being up Mein kampf even at a shallow level. And to ignore it is disingenuous to education.