If you watched this song being sung on Idol, or even if you haven't heard about this curious event, check out Bob Kauflin's take. He's nailed it, and his comments have significant Christ and culture applications. There is very much an, "on the one hand / on the other hand" response required for this application of a Christian song in pop culture, but the implications can be extended deep into popular Christian events and movements, and non-Christian events and movements that have adopted Christian content.
We live in interesting times.