When it is Excessive
The basic way in which the vice of superstition is opposite to religion is that superstition goes to excess. The great theologian Zanchi said, “If you add something to what which Christ established, or if you follow something added by others, [e.g.,] if you add other sacraments …, or other sacrifices … or if you add rites to the ceremonies of some sacrament, all those are rightly called by the name ‘superstition’.” Superstition is done “beyond what is established” [by Christ]. It is something used in God’s worship on no basis other than human appointment.
When it is Misdirected
Superstition gives worship either to whom it does not owe it, or not in the way in which it owes it. A ceremony is superstitious, even if it gives worship to God, when it is done inordinately, or when the worship is performed otherwise than it should be. For example, God is worshipped by baptism, but there is a problem with baptisms administered in private, because (as pointed out in the Leiden Synopsis) baptism is a supplement to public ministry, not to private exhortation. Similarly, the Church Fathers of the fourth century regarded the private administration of the Lord’s Supper as something “inordinate” in the same sense.
When it is not Edifying
Some things have no necessary or profitable use in the church, and cannot be used without being superstitious. It was according to this rubric that the Waldenses and Albigenses taught against the exorcisms, breathings, crossings, salt, spittle, unction, chrism, etc., used in baptism. As these were neither necessary nor requisite in the administration of baptism, they occasioned error and superstition, rather than edification to salvation.
When it Displaces Necessary Duties
A ceremony is superstitious when it is not only used in God’s worship unnecessarily and unprofitably, but in fact it hinders other necessary duties.