So it’s okay for 5 year olds to learn about it?
Also, what agenda?
It's okay if they HAVE to learn about it. If my kids have friends with gay parents and they notice and ask the question, i want to tell them in a way i deem appropriate. If they didn't ask, I'd rather they learn about it all in their early teens when their minds are more developed, when they're probably experiencing puberty etc and it's relevant for them to have that sort of information.
What Agenda? There are two lobbies at play right now. An anti gay lobby and a "everyone should be gay" lobby. They're both working hard to enforce their views and lifestyle choices on other people and more importantly on schools.
I'll give you an example. The school my cousins go to have switched their toilets to unisex toilets. They've done this so the toilets are non gender defined and anyone who doesn't confine to biological gender identities can go to the toilet without feeling labelled. Now you have a situation where some girls are not using the toilets at school because they feel uncomfortable sharing toilets with boys. I've seen these toilets. They don't have a door to the entrance, they do have stalls with doors, the stalls are out of sight by the sinks and hand dryers aren't. The headteacher also happens to be gay. That kind of stupid decision is clearly driven by a chip on someones shoulder.
The same school with the same headteacher have made some really great moves to tackle homophobia. In the UK kids routinely call each other gay as an insult, this school gives detention to anyone who uses the word gay as an insult, even between friends.
On the other side of things i'm in a whatsapp parents group about RSE and it's clear as day that some of the people in that group are outright homophobes. I am a Muslim and I consider homosexuality to be a sin, but i'll never let that impact how I treat a gay person. There are some people on the group who don't share that basic level of courtesy towards other humans, and they're sharing all sorts of content from places like the Daily Mail, whipping up hysteria.
For example someone shared a screenshot (no url, alarm bells ringing already) about different sexual practices, including oral sex, rimjobs etc and said this was part of the RSE curriculum. It might be for 16 year olds, it won't be for 6 year old - i'm pretty sure of that, but the person who shared it, didn't provide any detail - they're trying to present it all as some sort of hedonistic movement to sexualise their kids. Another example of an Agenda, albiet on the opposite end of the spectrum.
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Fact of the matter is, you might have a different understanding of what is appropriate and when - good for you. You do what suits for your kids, and i'll do what suits me for mine.