I wrote a letter to Vårt Land again. It was in response to what a principal from a christian private school wrote, but since I didn't have it in front of me (and din't even remember his name) I didn't direct it at him specifically.
My basic point is that it would be wrong for the state to prevent parents from instructing the beliefs to their children, even when these beliefs are unfortunate and wildly opposed to the views of the majority (or in other words, just plain wrong).
I took the new chronology theories supported by Anatoly Fomenko as an example, along with creationism. Hopefully the creationists see that there are problems with allowing everyone to teach anything.
To amend that, I suggest that although society can't censor parent's instruction, society as a whole also has a duty of instructing its children, without being censored with the parents. What I propose (in fact I think this is more or less current law) is that in the standard lessons such as science and history, the official views should be taught - by people who know and believe in them, otherwise it won't be a fair representation. Then, in lessons peculiar to their school, the unorthodox beliefs will be taught. Although the teachers in these classes can speak as if creation was a fact and misrepresent science all they wish, it must be obvious to the students that this is not what society at large believes: they can't call the class "science" (or "naturfag"), because that is reserved for the official views. If this confuses the students, well, that's a pity, but such is the price of being a minority in a pluralistic society.
The alternatives, which are
1. supressing some or all dissenting views based upon some arbitrary criteria
2. Allowing all views to be taught as equally valid
are worse, and unacceptable, although I suspect that many people will choose 1. and make poor attempts at explaining why of course their beliefs are reasonable, but everyone elses is not, and should be disallowed.
I could have chosen holocaust denial as an example rather than the more benign "the middle ages never existed" theories, but out of respect for Godwin's law I didn't. Godwin's law applies in more places than usenet, it's just bad form to draw in nazis everywhere, it makes people shut their ears, even when there are important points to be made.