It is not necessary for a man formally to deny God and Christ, in order to be an idolater. Far from it. Professed reverence for the God of the Bible and actual idolatry, are perfectly compatible. They have often been done side by side, and they still do so. The children of Israel never thought of renouncing God when they persuaded Aaron to make the golden calf. "Here are your gods," they said, "who brought you up out of Egypt." And the feast in honor of the calf was kept as a "festival to the LORD (Jehovah)" (Exodus 32:4, 5).
Jeroboam, again, never pretended to ask the ten tribes to cast off their allegiance to the God of David and Solomon. When he set up the calves of gold in Dan and Bethel, he only said, "It is too much for you to go up to Jerusalem. Here are your gods, O Israel, who brought you up out of Egypt" (1 Kings 12:28).
In both instances, we should observe, the idol was not set up as a rival to God, but under the pretense of being a help--a steppingstone to His service. But, in both instances, a great sin was committed. The honor due to God was given to a visible representation of Him. The majesty of Jehovah was offended. The second commandment was broken. There was, in the eyes of God, a flagrant act of idolatry.
Let us mark this well. It is high time to dismiss from our minds those loose ideas about idolatry, which are common in this day. We must not think, as many do, that there are only two sorts of idolatry--the spiritual idolatry of the man who loves his wife, or child, or money more than God; and the open, gross idolatry of the man who bows down to an image of wood, or metal, or stone, because he knows no better. We may rest assured that idolatry is a sin which occupies a far wider field than this. It is not merely a thing in pagan lands, that we may hear of and pity at missionary meetings; nor yet is it a thing confined to our own hearts, that we may confess before the mercy-seat upon our knees. It is a pestilence that walks in the Church of the Living Christ to a much greater extent than many suppose. It is an evil that, like the man of sin, "that sets himself up in God's temple, proclaiming himself to be God" (2 Thessalonians 2:4).
It is a sin that we all need to watch and pray against continually. It creeps into our religious worship unnoticed, and is upon us before we are aware. Those are tremendous words which Isaiah spoke to the faithful Jew--not to the worshiper of Baal, remember, to the man who actually came to the temple (Isaiah 66:3): "Whoever sacrifices a bull is like one who kills a man, and whoever offers a lamb, like one who breaks a dog's neck; whoever makes a grain offering is like one who presents pig's blood, and whoever burns memorial incense, like one who worships an idol."
This is that sin which God has especially denounced in His Word. One commandment out of ten is devoted to the prohibition of it. Not one of all the ten contains such a solemn declaration of God's character, and of His judgments against the disobedient: "I, the LORD your God, am a jealous God, punishing the children for the sin of the fathers to the third and fourth generation of those who hate me" (Exodus 20:5). Not one, perhaps, of all the ten is so emphatically repeated and amplified, and especially in the fourth chapter of the book of Deuteronomy. This is the sin, of all others, to which the Jews seem to have been most inclined before the destruction of Solomon's temple. What is the history of Israel under their judges and kings but a sorrowful record of repeated falling away into idolatry? Again and again we read of "high places" and "false gods." Again and again we read of captivities and chastisements on account of idolatry. Again and again we read of a return to the old sin. It seems as if the love of idols among the Jews was naturally bone of their bone and flesh of their flesh. The besetting sin of the Old Testament Church, in one word, was idolatry. In the face of the most elaborate ceremonial ordinances that God ever gave to His people, Israel was incessantly turning aside after idols, and worshipping the work of men's hands.
This is the sin, of all others, which has brought down the heaviest judgments on the visible Church. It brought on Israel the armies of Egypt, Assyria, and Babylon. It scattered the ten tribes, burned up Jerusalem, and carried Judah and Benjamin into captivity. It brought on the Eastern Churches, in later days, the overwhelming flood of the Saracenic invasion, and turned many a spiritual garden into a wilderness. The desolation which reigns where Cyprian and Augustine once preached, the living death in which the Churches of Asia Minor and Syria are buried, are all attributable to this sin. All testify to the same great truth which the Lord proclaims in Isaiah: "I will not give my glory to another or my praise to idols" (Isaiah 42:8).
Let us gather up these things in our minds, and ponder them well. Idolatry is a subject which, in every Church of Christ that would keep herself pure, should be thoroughly examined, understood, and known. It is not for nothing that Paul lays down the stern command, "Flee from idolatry."
4. You shall not make for yourself a graven image or any likeness which is in the heavens above, which is on the earth below, or which is in the water beneath the earth.
5. You shall neither prostrate yourself before them nor worship them, for I, the Lord, your God, am a zealous God, Who visits the iniquity of the fathers upon the sons, upon the third and the fourth generation of those who hate Me,
20. You shall not make [images of anything that is] with Me. Gods of silver or gods of gold you shall not make for yourselves.
Exodus 20
Making the golden calf was absolutely against these commandments. We know this because of:
7. And the Lord said to Moses: "Go, descend, for your people that you have brought up from the land of Egypt have acted corruptly. - Exodus 32
1. When the people saw that Moses was late in coming down from the mountain, the people gathered against Aaron, and they said to him: "Come on! Make us gods that will go before us, because this man Moses, who brought us up from the land of Egypt we don't know what has become of him." - Exodus 32
Though Aaron's intent seems to have been an idol and altar dedicated to God, as per:...
5. When Aaron saw [this], he built an altar in front of it, and Aaron proclaimed and said: "Tomorrow shall be a festival to the Lord." - Exodus 32
...God is the final judge as to whether or not it's proper as per the above verse 7.