And I’ll raise you the differences between the Roman Rite and the Orthodox. They are not insignificant doctrinally and they have been in schism for over 1,000 years with each claiming to be the original version of Catholicism with the other in schism.
Nor is the fact that there are many Protestant denominations proof of theological differences. There is far less difference between many Protestant denominations that Catholics suppose. Some of the denominational “differences” are simply the focus of their mission.
Much of the reason for many denominations is simply geography.
Nor does being under the headship of one leader any guarantee of unity of theology and doctrine as witnessed by Catholicism. I’ve met more Catholics than I can count who are OK with abortion and homosexual “marriage” and who vote democrat in EVERY election.
The long and short of it is that Catholics are in no position to point any fingers about doctrinal differences between denominations in light of the doctrinal differences within theirs.
So who is right? Rome, the Vatican, or the Orthodox?
How’s Francis working out for you?
Is that a rhetorical question or one directed to me? If the latter, the answer is not at all. He's not my Pope.
Let's not pretend that differences and problems related to doctrine and interpretation and application of scripture is a "mainly Catholic" problem. You marginalize the differences between the 35K+ Protestant denominations. I would differ. The fact that there are 35K+ Protestant denominations speaks for itself.
The sad fact is that there is division across Christendom. I contend that the source of these divisions is not the scripture but how men and denominations interpret and apply scripture. I wish I knew how all Christians can be one as Christ and His Father are one, but I'd be a liar to make such a claim. Hopefully, Jesus' prayer will be answered this side of heaven.
Despite the division between Believers, I choose that division will not divorce me from fellowship with other Believers. By Believers, I mean those who Believe that Jesus is the Christ and that through His life, death (sacrifice) and resurrection, we are saved from hell and promised eternal life in heaven.