In 1 Peter 3:15-16 we see that we Christians should be ready to give people an answer for what we believe and why we believe it, and to do it in a kind manner. Being able to give an answer or reason is also referred to as apologetics. It is knowing what you believe and why you believe it, and communicating that effectively.
Apologetics are not just for “special forces” Christians. We are all called to give an answer. That sounds daunting but don’t worry, we don’t have to study all the science there is and get a PhD in anything to do it. Not that studying isn’t a part of it; after all, people will ask you some difficult questions that you don’t know yet. But you don’t have to be a super-genius, famous scientist, or well-known apologist to know what you believe and why you believe it. That’s literally all you need to know: What do I believe and why? Then you just need to do it in a kind and winsome manner. Don’t be angry, belligerent, or gruff about it, just be every bit as loving as God has called you to be.
To be ready we must sanctify God in our hearts, meaning we acknowledge and respect His holiness by giving Him the place He should hold in our lives. Build your relationship with God and let Him build with you. Study the Bible. Listen to God and do what He says. The more you know God and His words, the more you will know about your beliefs, the better you will be able to talk to others about your reasons for having them, and the more loving and understanding you will be towards those people.
And remember, no one has ever been argued to the Kingdom of God. You’re only responsible for giving a reason for your beliefs, not changing the beliefs of others. Your job is to witness, telling them about Jesus and showing them love. It’s God’s job to do the calling and the changing. If someone is going to change it will be because God has called them and they have chosen to heed.
This is part of the Great Commission (Matthew 28:18-20; Mark 16:15; Acts 1:8). People have questions; go answer them with God’s love and guidance.