Christian testimony and challenges of postmodernism and cultural diversity of our cities. The internal challenges of the Church with its religious mentality and lack of corporate missionary identity. The fundamental missionary identity of the Church and her mandate as servant of the Kingdom of God. Mission of the Church and vision of the Kingdom in connection with the doctrine of the Trinity. Church models, witnessing strategies to the world. Challenges, problems and opportunities of our cities. Special situation of contemporary Quebec: culture and the challenge of thinking in missiological terms.