I'm all for respecting others cultures and religions, until that culture expects us to act in a harmful way to another. And when it does arguably result in harm, then we have to remove emotion and religion from the picture and work on rational, logical evidence based approaches.
Why is it people make the point about respecting cultures with this specific story, but don't do it with say female genital mutilation?
Only a true bloody moron would say "oh, mutilation of those girls is fine because it's their culture", and I'm sure you'd agree?
The story of not educating children on non-binary relationship does come with clear harm to two groups in my mind; it furthers the idea that homosexuality (or any other relationship) is abnormal or unacceptable, and it damages these kids by hiding them from things they simply are going to come across in life in the UK.
We should therefore remove religion, remove emotion, and look at objective logical evidence - does teaching about these things directly benefit children and wider society?
Now does teaching these things directly damage Islam? My opinion is no, it doesn't - but I can see how an argument to say yes it does can be formed. You could argue that by suggesting these things are perfectly acceptable it is going against the word of God, and if God was talking whack on this topic what else was he talking whack on?
But the key differences here is - these lessons aren't teaching kids about what is right or wrong (beyond consent). They are teaching kids about stuff that exists. Simple as that, kids will form their own view.
Comparatively those opposing it aren't simply teaching, they are attaching a statement in whether it is right or wrong as well.
Kids are told what to hold as a view - that is unacceptable.
This isn't a blurry line for me. Respect religion and culture all day long, but when it crosses to directly impacting another, then we have no option but to look at which is least damaging for wider society in an objective way.
And anyone who thinks gays should be criminalised, locked away (if not worse) is clearly damaging to wider society in an objective way.