Icons aren’t idols because no one is worshipping them.
It's also a matter of basic biblical language.
An eidlon is one thing, and an eikon is another. The New Testament consistently presents an eidolon in the negative, the pagans worshiped idols (eidolona); however eikon is used in many ways, but very often positively. Christ is the eikon of God.
ὅς ἐστιν
εἰκὼν τοῦ θεοῦ τοῦ ἀοράτου πρωτότοκος πάσης κτίσεως - Colossians 1:15
The Septuagint version of Genesis 1:27 speaks of human beings being made in God's
eikona
καὶ ἐποίησεν ὁ θεὸς τὸν ἄνθρωπον κατ᾽
εἰκόνα θεοῦ ἐποίησεν αὐτόν ἄρσεν καὶ θῆλυ ἐποίησεν αὐτούς
The Bible clearly makes a distinction between images in a good sense, and images in a bad sense. The idea that all images are violations of the First Commandment is neither Jewish nor Christian, but is an innovation of Islam. However, in the worst case scenario, it is flagrantly Gnostic as it denies the innate goodness of material creation, the innate goodness of the physical world.
The difference between sacred images and idols is that the latter robs the Creator of His rightful worship by replacing Him with something false or by trying to drag Him down to be represented or depicted in the same way as any other false pagan god.
This is also why, historically, images of God the Father are considered illegitimate, likewise with the Holy Spirit. Since the Divine Essence cannot be depicted. But Christ, the God-Man, is depicted in His physical humanity. This is why this is an Incarnation issue.
But God has declared that He has an Image. He created human beings to bear His
selem, or in Greek
eikona. Through the fall the Divine Image has been battered and bruised and distorted by sin and death; in Christ God restores the Divine Image. As Christ is the New and Second Adam. Icons serve a ministerial purpose in asserting that the Good Creator is present to us in and through His creation. Again, that's what the Incarnation is: God became flesh. That's what the Sacraments are, tangible material grace. God's own word, the Scriptures, did not fall down immaterial from the voiceless lips of angels; but through human authors and human prophets, written with ink and parchment.
We are Christians, not Gnostics. We affirm a Good Creator God who made sky, land, and sea.
"
The Church, though dispersed throughout the whole world, even to the ends of the earth, has received from the apostles and their disciples this faith in one God, the Father Almighty, Maker of heaven, and earth, and the sea, and all things that are in them; and in one Christ Jesus, the Son of God, who became incarnate for our salvation; and in the Holy Spirit, who proclaimed through the prophets the dispensations of God, and the advents, and the birth from a virgin, and the passion, and the resurrection from the dead, and the ascension into heaven in the flesh of the beloved Christ Jesus, our Lord, and His appearing from heaven in the glory of the Father 'to gather all things in one' and to raise up anew all flesh of the whole human race," - St. Irenaeus, Against Heresies, Book I, Ch. 10:1
-CryptoLutheran