10 What reason have you for saying that the law of Moses is pure Paganism? Is it because it speaks of a temple, and an altar of sacrifices, and priests? But all these names are found also in the New Testament. "Destroy," Christ says, "this temple, and in three days I will raise it up;" and again, "When you offer your gift at the altar;" and again, "Go, show yourself to the priest, and offer for yourself a sacrifice as Moses commanded, for a testimony unto them." What these things prefigured the Lord Himself partly tells us, when He calls His own body the temple; and we learn also from the apostle, who says, "The temple of God is holy, which temple you are;" and again, "I beseech you therefore by the mercies of God, that you present your bodies a living sacrifice, holy, acceptable to God;" and in similar passages.
As the same apostle says, in words which cannot be too often quoted, these things were our examples, for they were not the work of devils, but of the one true God who made heaven and earth, and who, though not needing such things, yet, suiting His requirements to the time, made ancient observances significant of future realities. Since you pretend to abhor Paganism, though it is only that you may lead astray by your deception unlearned Christians or those not established in the faith, show us any authority in Christian books for your worship and service of the sun and moon.
Your heresy is liker Paganism than the law of Moses is. For you do not worship Christ, but only something that you call Christ, a fiction of your own fancy; and the gods you serve are either the bodies visible in the heavens, or hosts of your own contrivance. If you do not build shrines for these worthless idols, the creatures of the imagination, you make your hearts their temple.
Source: Reply to Faustus the Manichaean (New Advent)