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I would guess that Lund being in Sweden, the fictional Runeberg is more than likely Lutheran. Borges I would have thought would have a Catholic background, though the German emigrant influence on Argentina must be considerable and might have either a Lutheran or Catholic cast to it depending on which region the bulk of immigrants hailed from. A Lutheran theologian might be expected to take a more austere view, one thinks of Kierkegaard, a Dane, but with that northern Lutheran existential angst, the silence of God, that would be in contrast to an Argentinian perspective in which the world teams with unseen forces. Critics seem to be split as to whether Borges is speaking through Runeberg or holding his views at arms length with a kind of implied critique of them.