No, I know what you mean, Rosie. Oddly, I'm less concerned about the occasional teacher with 'unusual' beliefs, as parents can usually counter those pretty easily, or complain to the Head/governors if there is a serious issue.
I'm more bothered by policies that must be taught, and ones that arise from 'collaboration with outside agencies' bother me the most. Nobody is going to object to anti-racist policies or teaching about religious diversity - or indeed any sort of 'some people believe' cultural differences - and it's arguable that anyone who does object should be overruled.
When it comes to teaching that dinosaurs were there in the Garden of Eden, or that people can choose between a hundred genders, however, (with no caveats about these things being belief systems that are far from universally held), then I feel that parents should be consulted, and have the option to remove their children from any classes where they are taught, and given lessons on evolution or biology instead. It's not ideal, as it could be divisive if not handled tactfully, but schools should not be indoctrinating kids with false information.
The jury's out here on the Santa issue. I can see that expecting a teacher to go along with that whilst objecting to other things I see as myths is probably hypocritical, but we bought into it and it gave the children a lot of pleasure, and nowadays it probably counts as a tradition. Maybe the topic should be avoided, (as it probably already is), and maybe so should the other controversial issues, so that school can concentrate on teaching topics that are more relevant to more children. But that could result in Gradgrindian teaching of facts, facts, facts, and I wouldn't like that either.
I told you I hadn't sorted out my own thoughts . I'm going round in circles, and am not much further forward than I was at the start.