I wholeheartedly agree with that verse, and Bergoglio will answer to Christ at his Particular Judgment for the chaos and confusion that he’s sown.
Given that there have been numerous Christians of all denominations throughout the ages, of all stripes, who failed to live up to that exhortation, what’s your argument?
I've none.
If showing how the One, True church seems to be so unsure of itself is an 'argument'; well, so be it.
"One indeed is the universal Church of the faithful, outside which no one at all is saved, in which the priest himself is the sacrifice, Jesus Christ, whose body and blood are truly contained in the sacrament of the altar under the species of bread and wine; the bread (changed) into His body by the divine power of transubstantiation, and the wine into the blood, so that to accomplish the mystery of unity we ourselves receive from His (nature) what He Himself received from ours."
--Pope Innocent III and Lateran Council IV (A.D. 1215)