Relevance is a big topic in the church these days.  Of course we ought to be relevant, but the issue is how such relevance is defined.  Doug Wilson in his A Primer on Worship and Reformation provides a good distinction between proper and improper irrelevance.

“There are at least two kinds of irrelevance.  One is the irrelevance of offering a bicycle to an oyster.  But there is another kind of irrelevance entirely, and that is the practice of setting forth the gospel of light and righteousness to those who love their darkness and iniquity.  We are commanded to be irrelevant in this second sense.  We are called to worship God in a way that is pleasing to Him, and to which unbelievers will be attracted only if God moves them in a sovereign and mysterious way.” (13)