“The marketing model, if followed, empties the truth out of the gospel. First, the needs consumers have are needs they identify for themselves. The needs sinners have are needs God identifies for us, and the way we see our needs is rather different from the way he sees them. We suppress the truth about God, holding it down in ‘unrighteousness’ (Rom. 1:18). We are not subject to his moral law and in our fallenness are incapable of being obedient to it (Rom. 8:7), so how likely is it, outside the intervention of God through the Holy Spirit, that we will identify our needs as those arising from our rebellion against God?
No, the product we will seek naturally will not be the gospel. It will be a therapy of some kind, a technique for life, perhaps a way of connecting more deeply with our own spiritual selves on our own terms, terms that require no repentance and no redemption. It will not be the gospel. The gospel cannot be a product that the church sells because there are no consumers for it. When we find consumers, we will find that what they are interested in buying, on their own terms, is not the gospel.”
–David F. Wells, The Courage to Be Protestant (Grand Rapids: Eerdmans, 2008), 52-3.