Using the government to indoctrinate goes both ways.
Once we have the decision to teach a science class, we teach the current state of science. Science, not religion passed off as science. I don't mind Creation being taught in public schools since it is a valid area of academic study. But it needs to be taught in the proper context as a religious belief, not as science.
Big government has no business forcing the teaching of their views and deciding which views will be officially approved and which will not. The market place of ideas should sort it all out without government forcing their officially approved views onto a captive audience of other people's children.
Statists have an agenda and enjoy big government force employed when the outcome agrees with what they desire. This is why all big government statists love the public schools to be centralized. They do not want true freedom of choice, they desire to indoctrinate because they are afraid of true freedom of choice.
This is the very nature of government schools.
If your views are acceptable they will be desired and your school will flourish, if not the market will close your doors. That is freedom, the other is not freedom.