What Does It Mean to Be a Responsive Christian?

In this blast from the past, J. Warner describes the nature of "Responsive Christianity". Why do some of us call ourselves "Evangelical Christians"? Is evangelism an important part of what it means to be a Christian? Are all of us called to be evangelists? What if we aren't gifted in that way? What role should "apologetics" play in the life of the Christian? Must we all be "apologists" if we want to call ourselves "Christians"? Why should we adopt a new definition and become "Responsive Christians"?