"mere superstition" is a correct and usable phrase in written English.
You can use it to refer to an unfounded belief that is not based in fact or reason. For example, "The villagers believed that the cursed amulet was responsible for their bad luck, but it was just a mere superstition."
Nor were popular fears mere superstition.
Dismiss tarot cards as a mere superstition.
The deep-seated fear that such disobedience would unravel our social fabric is mere superstition.
Is this mere superstition... or ancient Incan knowledge put to good use?
On the other hand religious belief that ignores the role of reason in religion is mere superstition and will result in bigotry and atheism, for "an Irrational Religion can never Rationally be conceived to come from God" (Occasional Thoughts, p. 36).
Because such customs and beliefs may be regarded as mere superstitions, the word survival usually has a slightly derogatory overtone.
Ask students to look at the list on the board created in the Warm-Up activity and identify the statements that will have a real scientific explanation, setting them apart from those that are mere superstitions.
If religious beliefs and opinions are found contrary to the standards of science, they are mere superstitions and imaginations; for the antithesis of knowledge is ignorance, and the child of ignorance is superstition.
He also dismissed Kepler's notion that the tides were caused by the pull of the Moon as mere astrological superstition.
The problems reviewed above belong to the past a past extending through centuries rather than to the present; of their mis-stated questions and misconceived solutions there now remain mere relics and superstitions which affect academic treatises more than they do the consciousness and culture of ordinary people.
