“You shall not make for yourself an idol, or any likeness of what is in heaven above or on the earth beneath or in the water under the earth. “You shall not worship them or serve them; for I, the LORD your God, am a jealous God, visiting the iniquity of the fathers on the children, on the third and the fourth generations of those who hate Me, but showing lovingkindness to thousands, to those who love Me and keep My commandments." ~ Exodus 20 4-6
"[An idol is] Any thing on which we set our affections; that to which we indulge an excessive and sinful attachment.
Little children, keep yourselves from idols. 1 John 5.
An idol is any thing which usurps the place of God in the hearts of [H]is rational creatures."
The last sentence is especially true. An idol is anything that usurps the place of God in the hearts of His rational creatures.
Look at the verse that is at the beginning of Exodus 20.
“I am the LORD your God, who brought you out of the land of Egypt, out of the house of slavery..."
The Lord is GOD! How dare we put things above Him in our lives? If we put anything above God, it is like saying that object is more important that He is in our lives.
"You shall not make for yourself an idol."