Give me an example of a verse or passage that two *saints* disagree on. The question is too vague.
Likewise for the Catholic church.
Is everything in the Catholic church by consensus? Do all those involved in deciding the *correct* interpretation of a verse or passage come to the same conclusion?
Or is it decided by majority vote?
The disagreement between Luther and Zwingli over the Eucharist is a case in point. The Church has always tried to resolve difference in synods and councils. Protestants also tried to do this for disputes among them; hence the several written Confessions, and even the negotiations with Catholics trying to arrange for a Council resolve differences. The multiplicity of sects comes because people choose to follow different leaders, or because some people prefer different styles of service, but very often because two brothers read the same text differently.