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Invited to renew the practice of the medieval "disputatio", two philosophers debate the existence of God, a traditional question now revived. Philippe Capelle (dean of the Faculty of Philosophy at the Institut catholique de Paris, President of the World Conference of the Faculties of Philosophy of Catholic Universities) exposes his arguments as a believer, a philosopher and a theologian. André Comte-Sponville (philosopher and author) defines his position as a "faithful atheist". The discussion is intense: rigorous and lively, precise and clear. The debate is cordial but uncompromising. This book confirms that on such a sensitive question, an open and generous dialogue is necessarily creative. To read it is to receive a lesson on intellectual integrity, respect for the other, humanity as we value it.