Let me simplify this for you then. Catholicism claims to have a unified set of beliefs, right? Yet, on some "pretty significant" doctrines, the Orthodox church's set of beliefs conflict with Roman Catholicism's and they have been for over a thousand years. You don't seem concerned with that in your endeavor to criticize "Protestants". What I have been saying all along is that there IS agreement about the major tenets of the Christian faith among those churches that remain true to their founding statements of faith. I've not denied that there exists denominations who no longer adhere to them as well as those who are counted as being "Protestant" that have NEVER even claimed to hold to those tenets.
What many Catholic apologists are keen to do is to trash all non-Catholic churches based upon their supposed disunity on a myriad of doctrines whether they be major or minor ones and that is simply not accurate. My contention is that there IS agreement on the major tenets of the Christian faith (Nicean Creed, for example) among most "Protestant" churches. But, as has already been ceded, some individuals and errant denominations aren't in agreement on them. There remain churches outside of Roman Catholicism who DO hold formally to the doctrines that make up the Christian faith. That's the best I can do to answer your question.
The division between the Orthodox and the Catholics concerns me. We indeed are not in full communion. But I haven't talked about it here because the discussion was about Catholics not knowing what Protestants believe. The Orthodox are not Protestant.
My contention is that there IS agreement on the major tenets of the Christian faith (Nicean Creed, for example) among most "Protestant" churches.
But that's not what's being discussed, at least by me. The claim was that Catholics don't know what Protestants believe. Protestant belief is not just about the major tenets or all Catholics (and all Protestants) would know what Protestants believe. But they don't. [There have been times on FR where I posted a posted belief and other Protestants were surprised by it.]
...some individuals and errant denominations aren't in agreement on them.
I'm not talking about the individuals. But the denominations who think other denominations are in error because of their differently held beliefs, all supposedly based on Scripture.