Not all idolatry is characterized by the worship of statues and even when it is, there are idols of the heart at play, as well. We might say they are the idols behind the idols.
God warned the nation of Israel over and over to repent and turn from their idolatry. Their refusal to do so took them into captivity and cost them the loss of their land, their homes, their freedom, and often their families. The consequences of idolatry are just as devastating today! So, how can we know if we have idols of the heart?