What is the biblical definition of superstition?
Scripture teaches that superstition is man's fear of and opposition to the powers of evil, not man seeking God. It is never the other direction. Paul used the term of Athenians who feared evil powers, warding them off through fetishes, rituals, and idol worship.
Les explains that when Paul got to Athens and went down that row of idols on his way to Mars Hill, they had one titled to the unknown God. Paul said, "I perceive that you're too superstitious." Les asks what he meant, and answers that they were afraid of the powers of evil, and that is what superstition is. Superstition is never the other direction; it is never a man somehow seeking God. Superstition is always man's fear and opposing the powers of evil. Les also notes Paul uses the same analogy and word that Israel was steeped in with their system of worship; the pagans were doing much the same with ritual and services. In Galatians 4:9, Paul addresses converts who came out of paganism, idol worship, and mythology into the light of his gospel.
Then Paul stood in the midst of Mars’ hill, and said, Ye men of Athens, I perceive that in all things ye are too superstitious.