What Is Idolatry?
Sin isn't only doing bad things, it is more fundamentally making good things into ultimate things. Sin is building your life and meaning on anything, even a very good thing, more than on God. Whatever we build our life on will drive us and enslave us. Sin is primarily idolatry.
I do it this way, I take a page from Kierkegaard's The Sickness Unto Death and I define sin as building your identity -- your self-worth and happiness -- on anything other than God. Instead of telling them they are sinning because they are sleeping with their girlfriends or boyfriends, I tell them that they are sinning because they are looking to their careers and romances to save them, to give them everything that they should be looking for in God. This idolatry leads to drivenness, addictions, severe anxiety, obsessiveness, envy of others, and resentment.
Making an idol out of something means giving it the love you should be giving your Creator and Sustainer. To depict sin as not only a violation of law but also of love is more compelling. Of course a complete description of sin and grace includes recognition of our rebellion against God's authority. But I've found that if people become convicted about their sin as idolatry and misdirected love, it is easier to show them that one of the effects of sin is to put them into denial about their hostility to God. In some ways, idolatry is like addiction writ large. We are ensnared by our spiritual idols just like people are ensnared by drink and drugs. We live in denial of how much we are rebelling against God's rule just like addicts live in denial of how much they are trampling on their families and loved ones.
Please do read the whole thing. I found it both thought provoking and convicting.