Really if you want to see pseudoscience in action take a good look at all the assumptions behind cosmology and astronomy. Redshift = distance is an ASSUMPTION and Edwin Hubble himself was the first to point that out. Or start being honest enough to teach students that LOTS of biologists as well as physicists like Sir Hoyle have valid doubts about the theory of evolution, and no they are not creationists. Their main problem with evolution being that it is so often presented as settled established fact when it really has a lot of serious problems that need to be worked out. Just saying that is some kind of heresy in most English-speaking areas. Truth is many scientists would love to replace evolution with a better theory.
Every hypothesis is "an assumption". But some stand up to scrutiny and offer a lot of explanatory value.
As for evolution, what you said isn't heresy - it's a claim that you didn't try to back up.