This is good. Really, it's not weird for the Pope - or the head or members of any denomination - to think of themselves as the "one true" anything. Of course they think that! They may be rather flexible about what the Big Guy in the Sky feels about deviations from the One True whatever, but it's pretty absurd to imagine they shouldn't think they've found the Truest Path.
While religious tolerance is a wonderful thing, overall the whole ecumenical "we're (believers) all on the same Judeo-Christian team" crap has been a horribly bad development. Keep the tolerance, cut the whole "we all basically agree" crap. We don't. We disagree.