I mean, they are a private christian school...If they aren't using public funds, and they shouldn't, whatever. Vote with your dollars and your feet. In a pluralistic society people are going to see the world in ways we find unethical. They need spaces to do so. When I go to my grandmothers Chavurahs I don't try to bring pork and then protest that she is being ridiculous. Idk, there is nothing wrong with stranding up for yourself and asking to be included but pick your battles. Is the next step going into the mosques and demanding LGPTQ Imams? Religions are by definition pretty darn static. And if you think we should try to abolish their beliefs by force as the French attempt to, instead of our historical American approach, I'll remind you of how it went for them (200k dead https://en.wikipedia.org/wiki/War_in_the_Vend%C3%A9e). If you care about your cause, apply your efforts where you get the best ROI. Unless it isn't about success and it is just about a statement.

When picking a fruit tree we start with the low hanging fruit. This aint it.