Agree. They can believe whatever they want, as long as their kids are exposed to the rational alternative and they're not allowed to impose their beliefs on the rest of us.
Not much society can do about the home-schooled kids ...
And why should it?
Let's think it through.
To validly do "something", society would first have to assess that "religion" (per se) is in some way fundamentally wrong, undesirable or evil.
I just do not subscribe to that notion. Even as an atheist, I can see religion in general as not a threat, but just another human construct trying to reconcile man's place in the universe. (Specific manifestations of particular religions may well be a different matter!)
Therefore religion entertains a number of the flaws of humanity. Like Capitalism or Welfare. It may not be perfect, but it requires constant maintenance to keep it in line. Not
annihilation.
I find it abhorrent that a society would completely ban religion from children (
Avert your eyes, son. Here comes a nun!!) because of a rather paranoid fear that xians are manipulative, deranged or irrational mind-twisters. Strike! That criteria endangers icons such as News Ltd, Gina Rinehart, Anzac/Australia Day, Scouts, the Union Movement, H.R. Nichols Society, the Business Council of Australia, ATSIG, etc, and
any school ever built!
Aboriginal kids would
necessarily have to be denied access to the so-called 'Dreaming' thereby losing contact with a fundamental part of their cultural heritage.
By all means monitor and temper any aberrations, but banning a complete human activity that does not fully address our prejudices or philosophical expectations is pretty severe. It would send us
beyond the Dark Ages!
I'd go to war over that one!