The present article is concerned with the themes that Heidegger addresses regarding religión during his time as a teacher in Freiburg. Here Heidegger is found searching for phenomenology as an original science, and in this context he highlights three human dimensions of singular importance: autobiography, art and religión. In this setting, it is shown that what is of interest is the way in which real life expresses itself. As for the concrete case of religión, religious life and its expression do not opérate as contained and container, distant from each other. At the same time, the heideggerian concern with philosophy of religión has to do with a description of the philosophical tendencies dominating in his day, before all else. The article concludes with a brief biographical reference to the personal crisis of the philosopher which leads him to abandon catholicism.onar el catolicismo.