You see Santa Clause, I see St. Nicholas.
Commandment #1: Thou shalt have no other gods before me.
I never heard of anyone who thought that Santa Claus was God. It's certainly not a widespread problem.
I see no evidence that Santa is being made into a god any more than the Easter Bunny. Methinks anyone who believes we are is a bit over the top, and should enjoy a nice cocktail.
 Another relic of Gentilism is the worship of images, neither instituted by Moses in the Old, nor by Christ in the New Testament; nor yet brought in from the Gentiles; but left amongst them, after they had given their names to Christ. Before our Saviour preached, it was the general religion of the Gentiles to worship for gods those appearances that remain in the brain from the impression of external bodies upon the organs of their senses, which are commonly called ideas, idols, phantasms, conceits, as being representations of those external bodies which cause them, and have nothing in them of reality, no more than there is in the things that seem to stand before us in a dream. And this is the reason why St. Paul says, "We know that an idol is nothing": not that he thought that an image of metal, stone, or wood was nothing; but that the thing which they honored or feared in the image, and held for a god, was a mere figment, without place, habitation, motion, or existence, but in the motions of the brain. And the worship of these with divine honour is that which is in the Scripture called idolatry, and rebellion against God. For God being King of the Jews, and His lieutenant being first Moses, and afterward the high priest, if the people had been permitted to worship and pray to images (which are representations of their own fancies), they had had no further dependence on the true God, of whom there can be no similitude; nor on His prime ministers, Moses and the high priests; but every man had governed himself according to his own appetite, to the utter eversion of the Commonwealth, and their own destruction for want of union. And therefore the first law of God was: they should not take for gods, alienos deos, that is, the gods of other nations, but that only true God, who vouchsafed to commune with Moses, and by him to give them laws and directions for their peace, and for their salvation from their enemies. And the second was that they should not make to themselves any image to worship, of their own invention. For it is the same deposing of a king to submit to another king, whether he be set up by a neighbour nation or by ourselves.
 An image, in the most strict signification of the word, is the resemblance of something visible: in which sense the fantastical forms, apparitions, or seemings of visible bodies to the sight, are only images; such as are the show of a man or other thing in the water, by reflection or refraction; or of the sun or stars by direct vision in the air; which are nothing real in the things seen, nor in the place where they seem to be; nor are their magnitudes and figures the same with that of the object, but changeable, by the variation of the organs of sight, or by glasses; and are present oftentimes in our imagination, and in our dreams, when the object is absent; or changed into other colours, and shapes, as things that depend only upon the fancy. And these are the images which are originally and most properly called ideas and idols, and derived from the language of the Grecians, with whom the word eido signifieth to see. They are also called phantasms, which is in the same language, apparitions. And from these images it is that one of the faculties of man's nature is called the imagination. And from hence it is manifest that there neither is, nor can be, any image made of a thing invisible.
 It is also evident that there can be no image of a thing infinite: for all the images and phantasms that are made by the impression of things visible are figured. But figure is quantity every way determined, and therefore there can be no image of God, nor of the soul of man, nor of spirits; but only of bodies visible, that is, bodies that have light in themselves, or are by such enlightened.
 And whereas a man can fancy shapes he never saw, making up a figure out of the parts of divers creatures, as the poets make their centaurs, chimeras and other monsters never seen, so can he also give matter to those shapes, and make them in wood, clay or metal. And these are also called images, not for the resemblance of any corporeal thing, but for the resemblance of some phantastical inhabitants of the brain of the maker. But in these idols, as they are originally in the brain, and as they are painted, carved moulded or molten in matter, there is a similitude of one to the other, for which the material body made by art may be said to be the image of the fantastical idol made by nature.
Part IV. Of the Kingdom of Darkness
Chap. xlvii. Of the Benefit that proceedeth from such Darkness
 Besides these sovereign powers, divine and human, of which I have hitherto discoursed, there is mention in Scripture of another power, namely, that of "the rulers of the darkness of this world," [Ephesians, 6. 12] "the kingdom of Satan," [Matthew, 12. 26] and "the principality of Beelzebub over demons," [Ibid., 9. 34] that is to say, over phantasms that appear in the air: for which cause Satan is also called "the prince of the power of the air"; [Ephesians, 2. 2] and, because he ruleth in the darkness of this world, "the prince of this world":[John, 16. 11] and in consequence hereunto, they who are under his dominion, in opposition to the faithful, who are the "children of the light," are called the "children of darkness." For seeing Beelzebub is prince of phantasms, inhabitants of his dominion of air and darkness, the children of darkness, and these demons, phantasms, or spirits of illusion, signify allegorically the same thing. This considered, the kingdom of darkness, as it is set forth in these and other places of the Scripture, is nothing else but a confederacy of deceivers that, to obtain dominion over men in this present world, endeavour, by dark and erroneous doctrines, to extinguish in them the light, both of nature and of the gospel; and so to disprepare them for the kingdom of God to come.
When did St. Nicolas become a god?