When we're talking about science classes (trying to stick closely with the OP here), then I have no problem with a science teacher explaining different scientific theories and taking that route.
What I do have a problem with is a teacher indoctrinating my children in religion when in science class. If a student raises their hand and says they believe in creationism and there is no such thing as evolution, the student should simply be told not that creationism is right or wrong, but that it is not a subject for science class. Because it's not.
For all that teacher knows, my children could be any flavor of Christian. Or Jewish. Or Muslim. Or Zooastrian. Or Hindu. Or Buddhist. Or a Native American religion. Or atheist. And what they are taught as far as religious beliefs and values is my decision as the parent, not theirs as the authority figure while they are a captive audience in school.
Which is pretty much what I've been arguing all along and getting blasted (and neg repped) for while you get applauded. LOL.
But the teacher should also not be saying that Evolution is an absolute, because it isn't, but shoud be explaining that it is the best and most credible explanations for the evolvement of various species and the scientific theory that is most credible at this time. But there are many unanswered questions yet within the theory of Evolution and it will be up to your generation--speaking to the students--to carry that further to greater knowledge and understandings. And the students you teach will add even more to the body of knowledge available to us.
As you said, schools should not be indoctrinating students with anything but should be giving them as much information, including varying perspectives, as possible and encouraging the students to think, expand their scope of perspective, ask questions, and believe that for all the great science we have, it is but a tiny fraction of all the science that we will likely one day have.
Had the OP started with the question of whether I want a Creationist teaching Creationism in Science class, that would be an easy no. Also I would not wanting a teacher telling students that Evolution was the only belief worth having and trumps your religious beliefs.
Both would be the same degree of close minded indoctrination.