superstition

An irrational belief that an object, action, or circumstance not logically related to a course of events influences its outcome.

A belief, practice, or rite irrationally maintained by ignorance of the laws of nature or by faith in magic or chance.

A fearful or abject state of mind resulting from such ignorance or irrationality.

Idolatry.

An ignorant or irrational fear of that which is unknown or mysterious; especially, such fear of some invisible existence or existences; specifically, religious belief or practice, or both, founded on irrational fear or credulity; excessive or unreasonable religious scruples produced by credulous fears.

A religious belief or a system of religion regarded as based on ignorance and fear; especially, the worship of false gods, as induced by fear; pagan religious doctrines and practices.

Hence, any false or unreasonable belief tenaciously held: as, popular superstitions.

Excessive nicety; scrupulous exactness.

Idolatrous devotion.