Paul wrote to Titus that overseers (pastors and elders) in the church are required to be especially adept at refuting those who oppose the truth of God (Titus 1:9). However this is not merely the assigned task of ordained men. All believers are commanded to engage in it as well. Addressing himself to all members of the congregation, Peter penned the following command: “sanctify Christ as Lord in your hearts, always being ready to give an answer to anyone who asks from you a reason for the hope that is within you, yet with gentleness and respect” (1 Peter 3:15). It is God Himself, speaking through Peter’s inspired words, who calls upon us as believers — each and every one of us — to be prepared to defend the faith in the face of challenges and questions which come from unbelievers — any one of them.
The necessity of apologetics is not a divine necessity: God can surely do His work without us. The necessity of apologetics is a moral necessity: God has chosen to do His work through us and called us to it. Apologetics is the special talent of some believers, and the interested hobby of others. But it is the God-ordained responsibility of all believers.
Referenced for this discussion.