Superstition mocks God

No pretext can justify superstition. This proved, first, from reason; and, secondly, from Scripture.

3. In this way, the vain pretext which many employ to clothe their superstition is overthrown. They deem it enough that they have some kind of zeal for religion, how preposterous soever it may be, not observing that true religion must be conformable to the will of God as its unerring standard; that he can never deny himself, and is no spectra or phantom, to be metamorphosed at each individual’s caprice. It is easy to see how superstition, with its false glosses, mocks God, while it tries to please him. Usually fastening merely on things on which he has declared he sets no value, it either contemptuously overlooks, or even undisguisedly rejects, the things which he expressly enjoins, or in which we are assured that he takes pleasure. Those, therefore, who set up a fictitious worship, merely worship and adore their own delirious fancies; indeed, they would never dare so to trifle with God, had they not previously fashioned him after their own childish conceits. Hence that vague and wandering opinion of Deity is declared by an apostle to be ignorance of God: “How be it, then, when ye knew not God, ye did service unto them which by nature are no gods.” And he elsewhere declares, that the Ephesians were “without God” (Ephesians 2:12) at the time when they wandered without any correct knowledge of him. It makes little difference, at least in this respect, whether you hold the existence of one God, or a plurality of gods, since, in both cases alike, by departing from the true God, you have nothing left but an execrable idol. It remains, therefore, to conclude with Lactantius, (Instit. Div. lib i. 2,, 6,) “No religion is genuine that is not in accordance with truth.”

John Calvin-Institutes of the Christian Religion-Book I-Chapter 4-Henry Beveridge Translation