I agree that a person's behavior, in general, demonstrates his true beliefs. James 2:14-26 indeed maintains that "faith without works is dead." Jesus Himself warned that He will reject those who call Him Lord while actively disobeying His commandments (Matthew 7:21-27). The Shooks must be commended, therefore, for their desire to address the obvious disconnect between what evangelicals profess to believe and how we actually live. The non-Christian world sees our hypocrisy, and uses it as an excuse to reject Christ.
That said, our good behavior, in and of itself, can only (at best) lead people to ask us about the Lord (1 Peter 3:15). Of course, we should remember the broader context of this verse. 1 Peter 3:8-22 offers guidelines to Christians in the midst of suffering for their commitment to Christ. The First Century believers to whom Peter originally wrote amazed their critics by clinging to Jesus when simply renouncing Him would have liberated them from persecution. They did far more than live good lives. They proclaimed Christ in an empire that made such proclamations punishable by death.
Their potential martyrdom went far beyond "right living." Good behavior certainly reflects God's standards for personal holiness, but without accompanying words about the grace of God that transforms a sinner, such good behavior degenerates into self-righteous morality that the Lord considers putrid (see Isaiah 64:6).
Rather than "being the message" by presuming that our actions will magically attract people to the Gospel, let's actually open our mouths and tell people the Gospel. The Word of God, not our morality, has the power to kindle saving faith!
14 How then will they call on him in whom they have not believed? And how are they to believe in him of whom they have never heard? And how are they to hear without someone preaching? 15 And how are they to preach unless they are sent? As it is written, “How beautiful are the feet of those who preach the good news!” 16 But they have not all obeyed the gospel. For Isaiah says, “Lord, who has believed what he has heard from us?” 17 So faith comes from hearing, and hearing through the word of Christ. ~~Romans 10:14-17 (ESV)