Peter (in 1 Peter) says that as we live a holy life; as we pursue faith among the Gentiles; as we respond to marriage, authorities, and even suffering in the power of the Gospel, people will be curious. As we shine the light of Christ into darkness of unbelief, people in the darkness will see the light. So at some point, someone will ask about your life and your faith.
Peter tells us to prepare in advance. 1 Peter 3:13-16: Who is going to harm you if you are eager to do good? 14 But even if you should suffer for what is right, you are blessed. “Do not fear their threats; do not be frightened.” 15 But in your hearts revere Christ as Lord. Always be prepared to give an answer to everyone who asks you to give the reason for the hope that you have. But do this with gentleness and respect, 16 keeping a clear conscience, so that those who speak maliciously against your good behavior in Christ may be ashamed of their slander.
He gives us some advice on how to do that: make it hopeful, personal, succinct, gentle, and respectful.
A hopeful, personal defense: The defense is of YOUR OWN faith, so it will be personal. It’s not a list of objective facts; it’s about God’s work in you, which gives YOU greater hope than anything else does.
A succint defense: People won’t listen to us for too long. Keep it short and sweet, depending on their interest.
A gracious, respectful defense: Not argumentative. Gentleness and respect asks us to humble ourselves and consider the perspective of the other person. Our ready defense should disply the gospel, even as we declare it. We demonstrate the character of God, even as we stand up for our faith.