Instead of withdrawing your child in fear and without knowledge... why don’t you ask exactly how and what will be being taught.
I suspect this will allay your fears. I will eat my hat if it’s a full day poking and prodding at the concept of The Gay. I guess it could be a school whose weak leadership has been overrun with trans activists pushing their own agenda, as I’ve heard about such things (on here).
But mainly, I’m betting it’s a lesson on social studies in general, mentioning different types of families in passing.
My DS’s school has a ‘Life Bus’ that comes each year and the classes have an hour class time each on it.
It’s fun, there’s a talking giraffe and a basic message of social positivity, kindness and diversity. Age appropriate and very sensitivity done. DS mainly remembers the giraffe though!
No worries and definitely no religious offensiveness generated.
In fact, it’s a CofE school, so it really doesn’t have to be a case of opposition and fear of knowledge.
Remember, children are young and things are taught in age appropriate ways. That doesn’t mean pushing them to the limits of their capabilities, in my experience it means seeding very simple and basic ideas that over the years they expand upon and reinforce (yes, years, not minutes!). Concepts such as tolerance and diversity in everyone’s different ways to live and love. And what is not acceptable in our society, like hatred, and inequality, and rejecting everybody’s right to live a peaceful life as they choose. So, no big scary concepts in there that Christians should have an issue with.
Unless they’re the sort of people who believe they should be able to exclude and penalise people for not believing the same as them... which I’m not convinced you are :)
Please, don’t make a decision based on fear and assumptions... seek out information. Then choose. With clarity of insight, not blindness of ignorance and an assumption that others will not behave or uphold the same values of love, tolerance and respect that you do.