People today think they have moved beyond idolatry, but there is definite idolatry.  It just looks a little different.  I'd argue that the way we (Americans) treat the flag is a form of idolatry.  We "pledge allegiance" to the flag when we should only pledge allegiance to God.  We treat it with pomp and ceremony in the same way people used to treat their graven idols.  We throw a fit when the flag isn't treated just so according to the religious formula.  Anyone who mistreats the flag is treated as a heretic that must be destroyed or driven away.  It is idolatry.

The flag is only one example, but one of which many American Christians are very much guilty.