Nativity scenes are a common sight at Christmas-time, not only in and around Roman Catholic churches and homes, but also in and around churches and homes of the professedly Reformed. In these nativity scenes, there is a figure of a baby in a manger. There is something dreadfully wicked in such scenes.
What could possibly be wrong with such an innocent-looking scene? For those who know God's Word, it is obvious -- the figure of the baby is a graven image that is supposed to represent God the Son. More glaring idolatry comes in the form of paintings, stained glass windows, or statues supposedly representing Jesus as an adult, but we had better not overlook the evil of that little figure in a manger.
Even less obvious is something that is more associated with the so-called "Good Friday" and "Easter" days but hangs year-round in many church buildings, even "Reformed" church buildings.
It is a cross.
One might say, "How could a cross be an idol? We do not worship it." I would ask you to ask yourself: WHY is it there? If any of your answers start with "It helps me ..." or "It reminds me ..." or "It teaches me ..." or anything similar, then it is an idol. Any image that is used as a help in worship is condemned as idolatry. Would you protest if it were taken down? Think about it.
Keep yourselves from idols.