 The United States Conference of Catholic Bishops ( <unk> ) explain the Catechism in their book entitled United States Catechism for Adults , published in 2006 . Regarding <unk> images , they expound that this command addresses idolatry that in ancient times expressed itself in the worship of such things as the " sun , moon , stars , trees , bulls , eagles , and serpents " as well as " emperors and kings " . They explain that today , idolatry expresses itself in the worship of other things , and list some as " power , money , <unk> and sports . " 
