12 Moses, then, casts no reproach on the sun and moon when he prohibits their worship. He praises them as heavenly bodies; while he also praises God as the Creator of both heavenly and earthly, and will not allow of His being insulted by giving the worship due to Him to those who are praised only as dependent upon Him. Faustus prides himself on the ingenuity of his objection to the curse pronounced by Moses on the worship of the sun and moon. He says, "If under a heathen monarch I am forced to worship the sun, and if from fear of this curse I refuse, shall I incur this other curse by suffering the punishment of crucifixion?"
No heathen monarch is forcing you to worship the sun: nor would the sun itself force you, if it were reigning on the earth, as neither does it now wish to be worshipped. As the Creator bears with blasphemers till the judgment, so these celestial bodies bear with their deluded worshippers till the judgment of the Creator. It should be observed that no Christian monarch could enforce the worship of the sun. Faustus instances a heathen monarch, for he knows that their worship of the sun is a heathen custom.
Yet, in spite of this opposition to Christianity, the partridge takes the name of Christ, that it may gather what it has not brought forth. The answer to this objection is easy, and the force of truth will soon break the horns of this dilemma. Suppose, then, a Christian threatened by royal authority with being hung on a tree if he will not worship the sun. If I avoid, you say, the curse pronounced by the law on the worshipper of the sun, I incur the curse pronounced by the same law on him that hangs on a tree.
So you will be in a difficulty; only that you worship the sun without being forced by anybody. But a true Christian, built on the foundation of the apostles and prophets, distinguishes the curses, and the reasons of them. He sees that one refers to the mortal body which is hung on the tree, and the other to the mind which worships the sun. For though the body bows in worship,— which also is a heinous offense,— the belief or imagination of the object worshipped is an act of the mind.
The death implied in both curses is in one case the death of the body, and in the other the death of the soul. It is better to have the curse in bodily death—which will be removed in the resurrection,— than the curse in the death of the soul, condemning it along with the body to eternal fire. The Lord solves this difficulty in the words: "Fear not them that kill the body, but cannot kill the soul; but fear him who has power to cast both soul and body into hell-fire." In other words, fear not the curse of bodily death, which in time is removed; but fear the curse of spiritual death, which leads to the eternal torment of both soul and body.
Be assured, Cursed is every one that hangs on a tree is no old wife's railing, but a prophetical utterance. Christ, by the curse, takes the curse away, as He takes away death by death, and sin by sin. In the words, "Cursed is every one that hangs on a tree," there is no more blasphemy than in the words of the apostle, "He died," or, "Our old man was crucified along with Him," or, "By sin He condemned sin," or, "He made Him to be sin for us who knew no sin," and in many similar passages.
Confess, then, that when you exclaim against the curse of Christ, you exclaim against His death. If this is not an old wife's railing on your part, it is devilish delusion, which makes you deny the death of Christ because your own souls are dead. You teach people that Christ's death was feigned, making Christ your leader in the falsehood with which you use the name of Christian to mislead men.
Source: Reply to Faustus the Manichaean (New Advent)