Well, that's what they're doing...they're rejecting a dogmatic faith in Darwin.
There's nothing wrong with discussing speciation by natural selection as a theory...because that's precisely what it is, regardless of how well validated it is.
If we're going to teach science, let's be rigorous about it.
That's all it claims to be. There is the fact of evolution (the Law of Faunal Succession), and a number of theories that attempt to explain this fact, eg. those of Lamarck, Buffon, and Darwin-Wallace. Only the last one, modified by modern genetics, has survived testing.
... regardless of how well validated it is.
The fact that a theory is well-validated and is accepted by 99+% of the researchers in its field should also be taught. The ToE is probably the most validated theory in all of science.