Yes, it is. In certain cases it might be harmless superstition unlike the kind of militant superstition that prompts people to oppress others, but superstition it is.
> Superstition is the belief in supernatural causality
But then the influenced people become the causality of their actions. These root "superstitious" influences would then exist in concept and have a real effect. Note that conceptual existence is enough to influence intelligent beings who can recognize these concepts.
There's also effects that aren't explained by science, yet. That is a playground for all sorts of possibilities.
