1. The only image of Christ given to us in His word are the sacraments. What would motivate men to go beyond this?
2. Lacking any physical description of Christ during His earthly ministry in His word, any depiction thereof would by necessity be a false depiction, and thus a false god.
3. If any depiction of Christ were accurate, it should move us to worship, and if it did not it would be vain.
4. Since no image of Christ can be accurate, to worship it is idolatry.
5. We all know that viewing pornography can evoke in us sinful reactions. We don't overcome those reactions by plastering porn on our walls and do our best to suppress them, we instead avoid them and call for their prohibition. I doubt any of you can say you never got the 'warm fuzzies' from looking at one of these images of Christ, and that, dear friends, was idolatrous worship rising up in your flesh. Why do we take the opposite strategy when dealing with those images than we do with porn?
6. The fact that many denoms and folks dear to us accept these images should have no bearing on this subject. The only authority is the word of God, and when what men approve contradicts that word, we are to follow the scriptures.
If creating an image of Christ not for the sake of worshipping it violates the Second Commandment's commandment against idolatry, so does making an image of "anything that is in heaven above, or that is on the earth beneath, or that is in the water under the earth" for reasons other than worshipping it. If you can't carve an image of Christ for this reason, you can't carve an image of a cow either.
The prohibition against these depicting things other than that of a representation of God is against creating them for the purpose of worship. All of those
can be depicted without any motive of worship. No image of God can be created
without any motive of worship. Please explain what possible motive
other than worship could be behind depicting God? So that we can appreciate the beauty of His visage as we might a pretty horse? What visage would that be?
Lots more could be said on the subject, but that's enough for me. See Westminster Larger Catechism Question #109 for scripture references .