Of course I hope that some children will become interested in Christianity. I don't think that is an awful thing. But I don't think whatever I say or do is going to magically convert them - I'm not that conceited about my own powers as a speaker! But it may give them access to something they wouldn't get elsewhere. It may broaden their minds. It may give them something to ponder on. It may plant a seed which flowers much, much later in their life. I don't know
From your perspective, I can see it's just fine that Christianity has more access to this opportunity than other faiths - and infinitely more than anyone who might want to go into a school and tell the assembled children 'In my view, religion is a construct invented by humans to meet their emotional and intellectual needs, and here's why.'
But from an objective perspective do you think it's ok that Christianity is given special status by law in our schools?
I'm pretty sure that when the British Humanist Association sends a speaker into a school they are hoping that the children will become Humanists. They probably tell them, as if it were a fact, that there is no God and no life after death too.
On what basis are you 'pretty sure'? Their public position is:
If collective worship was ended and RE became universally objective, fair and balanced (and included non-religious views such as Humanism), community schools would indeed be exactly what we would want a school to be – open and accommodating to all.
Religious faith is a private matter for families and communities, to be accommodated but not supported or favoured by the state and its schools. The BHA respects human rights and has no objection to optional worship or optional religious instruction.
Anyway, even if they were proselytising about Humanism, that would not be meeting the statutory worship requirements - I've not heard of the BHA speaking at school assemblies rather than in the context of RE lessons (which is properly comparative and 'some people believe').
You can't seriously be saying that Humanists have the same access and privilege in the education system as Christians, or even all other religions?
At any rate, I think it's no more right for Humanists to be pushing their lack of religious belief in children than it is for religious people to do that. A properly secular system provides a level playing field for all children.