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Pope Francis (c) attends an ecumenical prayer at the Lund Cathedral on October 31, 2016 in Lund, Sweden. Francis kicked off a two-day visit to Sweden to mark the 500th anniversary of the Reformation -- a highly symbolic trip, given that Martin Luther's dissenting movement launched centuries of bitter and often bloody divisions in Europe. / AFP / VINCENZO PINTO (Photo credit should read VINCENZO PINTO/AFP via Getty Images)

Pope Francis (c) attends an ecumenical prayer at the Lund Cathedral on October 31, 2016 in Lund, Sweden.
Francis kicked off a two-day visit to Sweden to mark the 500th anniversary of the Reformation -- a highly symbolic trip, given that Martin Luther's dissenting movement launched centuries of bitter and often bloody divisions in Europe. / AFP / VINCENZO PINTO        (Photo credit should read VINCENZO PINTO/AFP via Getty Images)