At the beginning of his teaching and philosophical career, Heidegger indicates that the primordial object of philosophy is the factic life, for which he proposes the phenomenological method as central. His own interpretation of this method, directed towards accessing religious phenomena, distinguishes itself from other contemporary philosophical essays, in dialogical criticism, in order to, then, draw near to that phenomenon. Heidegger finds in the letters of Paul to the Galatians and to the Thessalonians a "paradigm" of the realization of the factic life, that he later incorporates into his own philosophy. To finish, the author posits a critical judgment and prospect of the Heideggerian enterprise from a theological perspective.