I dunno. I think any reasonable observer would first go through a phase of hypothesizing independent creation (not necessarily supernatural, just separate origins) for the major animal lines, and also a young-earth hypothesis.
If you look at things like the rate of river-delta formation, mountain erosion, etc., you pretty quickly arrive at an estimate of only 100,000 to 1,000,000 years for the age of the earth. It wasn’t until the advent of plate tectonics that we really understood the patterns of deep continental renewal.
And it took the very detailed observations of Wallace and Darwin to get past the idea of separate origins of species.
I think these errors – like Phlogiston! – are natural ones that any reasonable culture of natural observation must fall into. They will eventually outgrow them, but that takes a little more sophistication, hard work, extremely observant naturalists, and also some technological tools.
(Phlogiston works very well as a model for combustion, right up until the point where we learned how to measure the mass of gases. That isn’t a trivial accomplishment!)
Once the observations have exploded the old notions, then, yes, clinging to them is non-scientific and requires dismissal of the evidence.
There are still Flat Earthers!
It’s a variant of the creationist credo, “If you teach children they are descended from animals, they will behave like animals.” Now, this turns out to be an absurd fallacy. (Frankly, I could wish that humans behaved a little more like some animals, and less like some humans!) All it really means is that education needs to be comprehensive. The origin, not only of species, but of moral systems, needs to be taught, so that no child has to fall into the trap that the creationist so clearly foresees and dreads.
(Worst of all is the creationist who deliberately digs that trap, wanting children to fall into it, so that he will have evidence that the teaching of science and biology leads to children falling into traps. Circular logic from hell!)