Scarlet
My views point by point.
""If you want a state education, then you accept what the state defines as the curriculum."
"Even when what "the State" defines as being the curriculum is in clear opposition to the wishes of a majority of parents? Where is the mandate for that?"
The mandate for that is in the fact that they are a government elected by universal suffrage. But, more to the point, in the case we're actually discussing, it is NOT in clear opposition to the wishes of a majority of parents. The fact that a minority is vocal does not make it a majority.
"What about religious education? Should the right of parents to remove children from R.E lessons and collective worship also be removed?"
In my opinion, neither of these are properly part of an education. But, again, you are confounding two things.
RE is part of the curriculum and is supposedly taught as an academic subject. As such, yes, the right of parents to withdraw pupils should be removed.
Collective worship is a part of the school day rather than a lesson and participation implies a belief in the worship. As such, the parent (or the child) should have the option to opt out.
"Would you still feel so happy if the State decided to make some new statutory change to the curriculum, teaching something to which you, personally, were strongly opposed?"
No, I wouldn't. If they did, I would have to consider WHY I was so strongly opposed and what my child's best interests were. If I was still unhappy, I may take steps to lobby the government not to impose it. If I found out I was in a minority or if this action failed, my decision would then have to be whether to withdraw my child from the system altogether; or whether to condone truancy on those days. It is NOT for a minority, even me ( ... ) to start saying what can and cannot be taught. To do so is, ultimately, a far more dangerous precedent, as it assails the intellectual and academic freedom of the teaching corpus.
"We are talking here about the removal of a right which, up to now, has been available to parents. Will the next step be making the withdrawal age lower - say 12? Then removing the right altogether?"
Yes, remove the right altogether, I fully endorse that - on condition that the teaching is in keeping with an agreed curriculum.
"If the State is serious about encouraging parents to take more, and not less, responsibility for their children, then it needs to take care not to undermine perents by assuming a parental role."
It is clearly not an either/or. You are free to teach your children whatever you want them to know. Take all the responsibility you can for what your children learn, by filling in the gaps a school education will inevitably leave - but I would argue that creating MORE gaps is not the way to go.
"Personally, I have yet to be convinced that the answer to the high levels of teenage pregnancy and STDs in the UK is more sex education. Evidence suggests I may be correct." In many ways that is a red herring. A person's dignity depends upon a full and unbiased awareness of who and what (s)he is and how (s)he "works", physically and mentally. Why would you deny those facts to your loved ones?