This is why people who aren't sincere about the Lord can't defend the faith. They're not contending on an individual basis. This part is clear. We can't give any old answer, but an answer that's pleasing to God. Keep in mind that an answer is the end discourse to a question.
Some questions are traps.
We need to be wise and have sharp enough discernment to identify questions that should be answered. Note elements of evangelism and discipleship in the book of Acts. The book is replete with the element of curiosity. Many of those who were born again exhibited high levels of curiosity about what was happening in the lives of the disciples. When you get a chance, look at Acts 2, Acts 4, Acts 10, Acts 16, Acts 19, etc.