Before Sola Scriptura was an issue, the Roman Church, Greek Orthodox, Oriental Orthodox, Church of the East, Albigensians, Lollards, Hussites, and others had already rent the unity of the church.
And the period when there were three popes contending against each other to be the last one standing came prior to the Protestant Reformation also.
In short, "Sola Scriptura caused the disunity" is a favorite line of militant Catholics and sounds persuasive to them, but the facts are to the contrary.
Indeed,
Maurice W. Sheehan: In this lecture I want to talk about the causes of the Reformation. This is a rather standard approach to the Reformation because it is admitted by all that the Reformation did not just happen or come like a bolt from the blue...Part of the tragedy of the Reformation is that the Church before 1517 was unable to reform itself or to set in motion events or changes that would have led to a reform in the Church that would have satisfied its members and really affected change....
It is possible to go back deep into the Middle Ages when enumerating or toting up the causes of the Reformation. I would like to start simply with the fourteenth century....
The first thing to note is that in the fourteenth century there was a period of approximately seventy years, from 1309 to 1377, when the pope was not living or residing in Rome...In the midst of the pope living outside of the Italian peninsula, outside of Rome, there occurred one of those events in European history that mark an age forever, and that was the infamous Black Death...Not too long after the Black Death there occurred something that was far worse than the popes living in Avignon... they proceeded to elect a counter-pope in 1378 to the pope who was then living in Rome. This counter-pope was French. He went back to Avignon. The man already resident now in Rome stayed in Rome, and Christendom now had the spectacle of not one pope living where he shouldn't have been, but of two popes each claiming to be the rightful pope, one living in Avignon, the other in Rome...
And if we go to the clergy, to what we can call the lower clergy or the ordinary priests, we can say that one vice that many of them had was immorality. Many of them had women that they kept in their rectories by whom they had children, so they had families to support.
— Maurice W. Sheehan, O.F.M. Cap., Lecture 2: Prelude-Causes, Attempts at Reform to 1537; International Catholic University http://home.comcast.net/~icuweb/c01802.htm
And as some guy named Ratzinger explained,
"For nearly half a century, the Church was split into two or three obediences that excommunicated one another, so that every Catholic lived under excommunication by one pope or another, and, in the last analysis, no one could say with certainty which of the contenders had right on his side. The Church no longer offered certainty of salvation; she had become questionable in her whole objective form--the true Church, the true pledge of salvation, had to be sought outside the institution.
"It is against this background of a profoundly shaken ecclesial consciousness that we are to understand that Luther, in the conflict between his search for salvation and the tradition of the Church, ultimately came to experience the Church, not as the guarantor, but as the adversary of salvation. (Joseph Cardinal Ratzinger, head of the Sacred Congregation of the Doctrine of the Faith for the Church of Rome, “Principles of Catholic Theology,” trans. by Sister Mary Frances McCarthy, S.N.D. (San Francisco: Ignatius, 1989) p.196). http://www.whitehorseinn.org/blog/2...e-here-the-illusions-of-church-infallibility/)
Yet, 'the one duty of the multitude is to allow themselves to be led, and, like a docile flock, to follow the Pastors," "to suffer themselves to be guided and led in all things that touch upon faith or morals by the Holy Church of God through its Supreme Pastor the Roman Pontiff," "of submitting with docility to their judgment," with "no discussions regarding what he orders or demands, or up to what point obedience must go, and in what things he is to be obeyed... not only in person, but with letters and other public documents ;" and 'not limit the field in which he might and must exercise his authority, " for "obedience must not limit itself to matters which touch the faith: its sphere is much more vast: it extends to all matters which the episcopal power embraces," and not set up "some kind of opposition between one Pontiff and another. Those who, faced with two differing directives, reject the present one to hold to the past, are not giving proof of obedience to the authority which has the right and duty to guide them," "Nor must it be thought that what is expounded in Encyclical Letters does not of itself demand consent." (
Sources )
Moreover,. underneath the facade of RC unity based on official paper and perfunctory professions, Catholicism is rife with divisions, and on the practical level where it counts, Bible Christians for a long time have
attested to greater unity in core beliefs .
Furthermore, the divisions in Catholicism would be more manifest if they were were as doctrinally committed as Bible Christians tend to be.