Author, Christian Apologist and homicide detective J. Warner Wallace was a conscientious and vocal atheist till he was 35 years of age. He never thought that he would be where he is now. Many of his Christian co-workers who are also police detectives didn't see a need to take an investigative approach towards the Christian faith and beliefs.
Wallace then took it upon himself to investigate who Jesus was and the more he investigated, the more he believed the claims about Jesus. However, it was only when he looked into what the gospels said about him - about how he needs a savior, that he started putting his trust in Jesus instead of just believing about Jesus.
Here's the template for eyewitnesses' courtroom examination if you are looking to do your own research about Jesus Christ:
Wallace applied all these methods and process in his investigation of Jesus. He had to ask himself, if Jesus really rose from the dead, then what should he do with it? That is the game-changing question.