Is Mass Evangelism Effective? | Caicó, Brazil Crusade

Is Mass Evangelism Effective? Recently I finished earning my Doctorate of Ministry Degree at Oral Roberts University and the focus of my research was mass evangelism. I looked at historical, theological, and academic research into mass evangelism and my research project involved collecting information about an evangelism crusade that we did in Caicó, Brazil. So what did the research show about the effectiveness of doing mass evangelism?