The definition of idolatry, according to Webster, is “the worship of idols or excessive devotion to, or reverence for some person or thing.” An idol is anything that replaces the one, true God. The most prevalent form of idolatry in Bible times was the worship of images that were thought to embody the various pagan deities.
From the beginning, God’s covenant with Israel was based on exclusive worship of Him alone (Exodus 20:3; Deuteronomy 5:7). The Israelites were not even to mention the names of false gods (Exodus 23:13) because to do so would acknowledge their existence and give credence to their power and influence over the people. Israel was forbidden to intermarry with other cultures who embraced false gods, because God knew this would lead to compromise. The book of Hosea uses the imagery of adultery to describe Israel’s continual chasing after other gods, like an unfaithful wife chases after other men. The history of Israel is a sad chronicle of idol worship, punishment, restoration and forgiveness, followed by a return to idolatry. The books of 1 & 2 Samuel, 1 & 2 Kings, and 1 & 2 Chronicles reveal this destructive pattern. The Old Testament prophets endlessly prophesied dire consequences for Israel if they continued in their idolatry. Mostly, they were ignored until it was too late and God’s wrath against idol-worship was poured out on the nation. But ours is a merciful God, and He never failed to forgive and restore them when they repented and sought His forgiveness.
In reality, idols are impotent blocks of stone or wood, and their power exists only in the minds of the worshipers. The idol of the god Dagon was twice knocked to the floor by God to show the Philistines just who was God and who wasn’t (1 Samuel 5:1–5). The “contest” between God and His prophet Elijah and the 450 prophets of Baal on Mount Carmel is a dramatic example of the power of the true God and the impotence of false gods (1 Kings 18:19–40). The testimony of Scripture is that God alone is worthy of worship. Idol worship robs God of the glory that is rightfully His, and that is something He will not tolerate (Isaiah 42:8).
Even today there are religions that bow before statues and icons, a practice forbidden by God’s Word. The significance God places upon it is reflected in the fact that the first of the Ten Commandments refers to idolatry: “You shall have no other gods before me. You shall not make for yourself an idol in the form of anything in heaven above or on the earth beneath or in the waters below. You shall not bow down to them or worship them; for 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 20:3–5).
Idolatry extends beyond the worship of idols and images and false gods. Our modern idols are many and varied. Even for those who do not bow physically before a statue, idolatry is a matter of the heart—pride, self-centeredness, greed, gluttony, a love for possessions and ultimately rebellion against God. Is it any wonder that God hates it?
 Got Questions Ministries. (2010). Got Questions? Bible Questions Answered. Bellingham, WA: Logos Bible Software.