I think at one level you are entirely correct, and this is what is taught in The Wisdom of Solomon 16:5-10
For when the terrible rage of wild animals came upon your people and they were being destroyed by the bites of writhing serpents,
your wrath did not continue to the end; they were troubled for a little while as a warning,
and received a symbol of deliverance to remind them of your law’s command.
For the one who turned towards it was saved, not by the thing that was beheld, but by you, the Saviour of all.
And by this also you convinced our enemies that it is you who deliver from every evil.
For they were killed by the bites of locusts and flies, and no healing was found for them,
because they deserved to be punished by such things.
But your children were not conquered even by the fangs of venomous serpents, for your mercy came to their help and healed them.
However, as an incarnational faith, we raise that matter matters, and it is not immaterial that we acknowledge that in tangible and temporal expressions we are able to grasp the eternal and the intangible.
There are a couple of basic things about icons that really need to be understood. Firstly, Icons are not painted, they are written. They are stories designed to tell us more. Orthodox friends of mine regularly refer to them as windows; by this, they infer not that we look at the icon, but through the icon to something of the deeper truths of the Kingdom of God. They are in that sense signs pointing to salvation, and help us to glimpse the hope of glory that we might draw strength for the road ahead - very much in the way that Jesus drew strength in the Transfiguration for the road that led to death and ultimately resurrection and ascension.
I believe we are all called to be icons, in that those around us should hopefully be able to perceive something of the Kingdom of God in us or through us so that we might not only be blessed but be a blessing.