From seven billion people on our planet, only two billion are Christians and, from these, a majority are unpracticing Christians. As Pope John Paul II was writing in 1990, “The mission of Christ the Redeemer, which is entrusted to the Church, is still very far from completion” (Redemptoris Missio, 1). Considering all this reality, in the last century we have witnessed a revival of the kerygma in the field of theological research, both theoretical and practical. In the coming articles, we wish to present, in chronological order, the steps through which kerygma became the guiding figure of the renewal of the evangelization in the twentieth century. This article presents the contribution of Rudolf Bultmann to the kerygma.