Apologetics is the reasoned, intellectual defense of the Christian faith, responding to attacks and offering reasons for belief. It is the responsibility of every Christian to be ready to offer that sort of thoughtful answer to the best of our ability (I Peter 3:15), because such conversations are one tool that God uses to draw unbelievers to himself, encourage the faith of his people, and create a culture that is open to the claims of Scripture.
In many ways, everyday modern Christians can be better prepared for difficult apologetic discussions than any previous generation. The printing press and the internet offer Christians almost limitless resources to equip ourselves to challenge false ideas, and that is a very good thing. However, I am afraid that this wealth of resources has contributed to false and counterproductive ideas about what apologetic arguments can and should accomplish. Our misunderstandings are leaving Christians disappointed and frustrated after their exchanges with unbelieving skeptics, while the skeptics themselves evade the force of arguments that should be much more effective and compelling.
The basic problem is that many of us–whether consciously or not–expect apologetic arguments to be conclusive; to leave no rational option but belief. We expect the cosmological argument to leave absolutely no defense against the idea of a supernatural creator. We want our design argument to demonstrate the need for a universal designer with perfect clarity. We are disappointed if a historical argument leaves any room whatsoever for doubt about whether the modern Bible reflects actual first-century events. And so on. Because we know that God exists and the claims of Christianity are true, we expect our arguments to conclude with the same sort of conviction we ourselves feel. Unfortunately, there is both a theological and a tactical problem with such inflated expectations for our apologetic arguments.