I think people are confused it's not a sex ed lesson at all. It's a lesson about different families. There is a board up in school with pics of 2 mummy families and 2 daddy families etc.
Nothing sexual at all, I should imagine the school will encounter problems, we are a faith family, yet I talk with my children and explain, everyone has a right to believe and live the life they want. And we should respect that as we would expect to be respected regardless of difference.
Whatever religion a child is raised in, if they are LBGT, they are LGBT. I have three muslim friends, two who chose conventional marriages and lead a double life and one who refused and is shunned for society all raised in traditional muslim households.
Learning about LBGT or different families does not make them inclined that way, a person either is or isn't LBGT, and genetically predispositioned in the womb as I believe personally.
It does however normalise it in society where people will learn to respect rather than hate or fear their families being contaminated by LBGT, which I think we can see on this thread.
You can be a muslim or christian or any religion and believe it's not right and teach your children the same, but you can also teach them to respect other people's differences and life choices without conflict, it's called tolerance and being humble which are both admirable qualities taught in all religions.