4. Don't know about that. You can share the gospel all you want, but you have to make it presentable. I remember a Jahobah witness gave me a pamplet at work. I read it on my break and tried to pass it on to my coworker. She told me she was an atheist. At one point we were are all at a state of unbelief, which reads to me that you don't have to be a total atheist, ever, just to have doubts. But she did not believe a little, she did not believe a lot, she was a total atheist. Some atheists believe that Jesus was not who he said he was rather than he didn't exist. But if you can convert a total atheist (one who believed he never existed at all), then more power to you. Now if parents didn't go to church and drag me with them when I was little, it is possible I would be an atheist, but I'll never know.
Evangelism is telling people what Jesus did for
them.
Witnessing is telling people what Jesus did for
you.
According to scripture, every member of the Body of Christ has a part in the evangelistic mission of the Body, but not every member is an evangelist. The scriptural model for the evangelist makes three points:
1. An evangelist is called to that office. Not everyone is so called. (1 Corinthians 12)
2. An evangelist must be fully trained in theology by the Church. (Acts 18)
3. An evangelist must be commissioned to a specific evangelistic mission by the Church. (Acts 13)
4. The evangelist is accountable for the results of his mission to the Church. (Acts 15, Acts 21)
These four points modeled in scripture for evangelists are not necessary to give witness for what Jesus has done for you.
Although not everyone is called to be an evangelist, all believers are obligated to be witnesses to what Jesus has done in our own lives.
1. We are obligated to give witness to what we have personally seen and heard.
Always be prepared to give an answer to everyone who asks you to give the reason for the hope that you have. 1 Peter 3
As for us, we cannot help speaking about what we have seen and heard -- Acts 4
If anyone sins because they do not speak up when they hear a public charge to testify regarding something they have seen or learned about, they will be held responsible. -- Leviticus 5
2. Knowledge of theology is not necessary:
"I don't know whether He is a sinner, but one thing I do know. Once I was blind but now I see!" -- John 9
3. Witness alone can be immensely effective to bring people to the evangelist:
Then, leaving her water jar, the woman went back to the town and said to the people, “Come, see a man who told me everything I ever did. Could this be the Messiah?” They came out of the town and made their way toward him.
....
Many of the Samaritans from that town believed in him because of the woman’s testimony, “He told me everything I ever did.”
....
They said to the woman, “We no longer believe just because of what you said; now we have heard for ourselves, and we know that this man really is the Savior of the world.” -- John 4
But an important point is that whether as evangelists or witnesses, we are not responsible for causing
anyone to believe. That is the responsibility of God.
No one can come to me unless the Father who sent me draws them
....
This is why I told you that no one can come to me unless the Father has enabled them. John 6
All we are responsible for is laying it out there. God is responsible for enabling belief. We do not know who has been enabled. They don't even know they've been enabled. But we can know that there are people out there who are enabled, and those enabled will respond.