You are factually incorrect. While the numbers vary by sources, there are anywhere from 16 to 30,000 different Protestant denominations, individually led. They also espouse differing theology and are not unified.
The Roman Catholic Church consists of a total of 23 Rites, often called Churches. The are all in communion with the Holy See, at Rome. There is no division, merely variations developed through time and location. A person can be fully Syrio-Malabar and fully Catholic, as that is an accepted Rite of the Roman Catholic Church. The 22 Eastern Rites were called by Bl. John Paul II as the “Other Lung” of the Catholic Church.
Roman Catholicism is focused on Christ. The remainder of your sentence is incorrect.
Will say this again...Unity among believers is in Christ Jesus....regardless of their denomination or church association....who leads or who they call themselves.
But I will surely differ with you...there are many differences among the catholic churches....indeed. I would venture saying most catholic denominations do not agree with their gay bishops...nor with the the leaders who include voodoo and various other rites within their denomination..and fully credited by the leadership of the catholic denominations.
While this may be the case for rites, Rome abounds with disagreements over interpretations of Roman teaching and of tradition, even to the point of the SSPX sect and the sedevacantist schism.
Meanwhile, the Orthodox have substantial disagreements with Rome on what Tradition, Scripture and history teaches. Thus under both the Roman means of establishing truth (sola ecclesia) as well as SS you have disagreements and divisions.
But Scripturally the church did not begin under the premise that being stewards of Divine revelation renders them the perpetually assuredly infallible interpreters of it, contrary to the presumption of Rome.