What is the origin of the myth?

“Images were unknown in the worship of the primitive Christians . . . The admission of images into the church in the 4th and 5th centuries was justified on the theory that the ignorant people could learn the facts of Christianity from them better than from sermons or books.”— Cyclopedia of Biblical, Theological, and Ecclesiastical Literature, by McClintock and Strong, Volume 4, pages 503 and 504.
What does the Bible say?

“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.” (Exodus 20:4, 5, The Holy Bible —New International Version) The apostle John wrote to first-century Christians: “Little children, guard yourselves from idols.” —1 John 5:21.

Are images, as the churches claim, simply a means of approaching and honoring what they represent? “At first,” states The Encyclopedia of Religion, “images may have served primarily didactic [teaching] and decorative purposes; at least, they were defended on such grounds. But soon they came to fill admittedly devotional functions. This was especially true of the icons that became a prominent feature of Eastern Orthodoxy.” However, the prophet Isaiah rightly asked: “To whom can you compare God? What image can you contrive of him?” —Isaiah 40:18, The New Jerusalem Bible.

Compare these Bible verses: Isaiah 44:13-19; Acts 10:25, 26; 17:29; 2 Corinthians 5:7
FACT:

God does not approve of the use of images and icon