Similar things are in train in NZ already as part of sex and "values" education programmes approved by the State or in the process of being implemented.
The key issue is whether elected politicians (or unelected bureaucrats) should have the power to socially engineer a society according to their own values. After all, isn't this what the Left raises as the bogeyman of living under a theocracy?
The way I see it, the liberal left's stalking horse is simply a more insidious and dangerous theocracy, hiding under a disguise of alleged secularism simply to throw less intelligent voters off the scent.
A State-backed, anti-family, anti-God agenda is a religion. Nothing more, nothing less.