Have you ever had questions about God, Heaven, and Eternity? I hope so. As you talk to people on the streets or in their homes about the Gospel, some of them are going to have questions for you. It is not wrong to try to answer their questions, nor is it wrong to tell them that you don't know the answer, if you don't know.
Some people ask questions or make bold statements because they are being antagonistic. But others are asking questions because they are curious about the things of God, and probably never had the opportunity to ask anyone. Some people have deep seated doubts and fears, and would like another knowledgable person to help them with their questions.
There are times that it would be better to not answer the questions asked by a Skeptic. It takes practice and skill to know when to answer and when not to answer. "Answer not a fool according to his folly, lest you be like him yourself. Answer a fool according to his folly, lest he be wise in his own eyes." Proverbs 26:4 and 5 (ESV).
The Bible says to give a reason to every person who asks a reason of the hope in you. It also explains that Paul 'reasoned from the Scriptures' with people.
The big accusation people have, when sharing the Gospel, is that unbelievers generally think that Christians are not intelligent people, and that they have 'blind faith'. Sadly, in the past, this has been true, at least in part. I had seen a video recently about a discussion between creation/evolution and God/Atheism. There was a host person, along with a 'Christian' and Richard Dawkins. When the Christian man was asked about the origin of human beings, he simply pointed to Richard Dawkins and said to ask him, since he (Richard Dawkins) would know.
But we do know Who we believe in and are trusting in, and we know why we believe as well. Are you prepared to give answers to people while evangelizing or teaching? Or, are you just going to tell them that they have to have faith? After all, "God said it, I believe it, that settles it!" It might be settled in your mind, but its not settled in the minds of many other people, some of whom you may be talking to this week. Could this be the reason so many children leave the church when they become adults?
Let's stay on track with sharing the Gospel, but let's also consider the questions of those who are asking. Write them down, and get back with the person later on. And find answers to those questions before you go out next time.