“We are witnesses of all the things he did both in Judea and in Jerusalem. They killed him by hanging him on a tree,”
Mass hysteria (which some allege) could not have been sustained over a period of three or so years. People in general knew “what happened” vv. 37-38. A few observed up close.
Our faith is based on facts. Eyewitnesses saw what Jesus did and said. In every way the gospel is confirmed, by them and by miracles performed.