Jesus says “You will be my witnesses…”
In a courtroom, a witness isn’t expected to argue the case, prove the truth or press for a verdict; that is the job of the attorney. Witnesses simply report what happened to then or what they saw” Rick Warren
For many who are anxious about apologetics or about whether they can remember the doctrines right, this takes the fear away from sharing faith. It is simply about saying what difference God has made in a particular experience.