Edit (reply-limit): Thanks readerrr and cremno, valid points, will consider it in the future.
What I meant was, there have been theories before the current theory of evolution. For example Lamarck's one, which is long considered false but lately some aspects of it are reintroduced. If we would punish everyone for denying evolution we would be unable to advance it.
And of course this has nothing to do with teaching children biology. Of course children need to be taught evolution there.
a coherent group of tested general propositions, commonly regarded as correct, that can be used as principles of explanation and prediction for a class of phenomena
and not:
a proposed explanation whose status is still conjectural and subject to experimentation, in contrast to well-established propositions that are regarded as reporting matters of actual fact
We have a separate word for the latter: a hypothesis.
Adding the word "just" implies a misunderstanding of how the scientific method works, because it doesn't get any better than a good theory.