Tim Keller did a good bit in his book Counterfeit Gods. I didn't really read it, but the gist is, many Christians fail in identifying the idols of their lives. They are clear, that money is an obvious idol. But many would not see that volunteering can be an idol, loving kids, loving their spouses, love, charity, etc. can all be idolized. All but God are idolizeable.
I will put forth these 3 as the things most Christians today tend to idolize and deny their failure in identifying such:
- The Bible
- The church/Sunday Worship
- The pastor/preacher