In our defense of Christianity, as in the entirety of our Christian lives, we are to be a holy people. . . . It seems to me anecdotally, that this may be one of the most neglected aspects of Christian living currently. Someone whose ministry is focused exclusively on college-aged people recently said to me that the burning need among that age group of Christians is holiness. It may just be that the cultural pressures are winning a subtle victory in this regard. If that is true, then it is serious indeed. Scripture is clear that without holiness no one will see the Lord (Heb. 12:14). In wanting to be ‘relevant’ to those who are not in Christ, we may be displaying more of a life ‘in Adam’ than we might think. This bodes ill for the art of persuasion in covenantal apologetics. If Christianity makes little difference in the way we walk and talk on a day-to-day basis, we should not think that there will be any obvious reason or others to want to consider a life in Christ.”
K. Scott Oliphint, Covenantal Apologetics: Principles and Practice in Defense of Our Faith