It nestles among profoundly human reactions. The strength and meaning of each depends on their being given freely rather than dutifully. How we believe is more akin, then, to how we love than to how we obey. Religion is essentially a mystery more than a puzzle and its appeal is to the human imagination rather than to the will. If this Vatican document were carbon dated, its half life would be found to have already passed.
Nature erodes things according to their composition.
Thus a line drawn in the sand, as some have described this work, is ruffled easily by the wind and is hardly ever there in the morning. For all its good intentions, this paper is more a threat to itself than to ecumenical relations. Its presumption that humans can be commanded to believe takes it out of the realm of the believable. Don't spend a lot of time arguing about it. It will barely be remembered a year from now.