:There is a point to the above comments, and Carl's comments as well. The question about a "List of opinions heretical to the Catholic Church" is that it is an obvious spinout from a broader "List of opinions considered heretical in Christianity" and would almost certainly have a remarkable degree of overlap with similar lists for the Eastern Orthodox, Oriental Orthodox, and Assyrian churches. We try in general to avoid having such substantive duplication of material. 1054 is one cut-off point - I might think the Reformation might be a better one, but that is just one opinion. Personally, I would at least initially opt for a single List of Christian heresies, with subsections for early Christianity prior to either the East-West schism or the Reformation, and then separate lists for opinions since that point, or, possibly, some sort of table format which would allow separate indicators for each relevant opinion regarding certain widely rejected beliefs. I do, in general, think that a specific list on early heresies, perhaps under a different title, would be useful, particularly for the period before the separation of the churches. There certainly were a lot of beliefs during that time which were later rejected, and I think there is material enough for it. His last point, about formal heresies and material heresy, or perhaps "specifically rejected beliefs" and "organizations (churches, etc.) effectively, but not necessarily specifically, rejected for espousing rejected beliefs," is also a good one, and is actually one of my personal bigger concerns. I think in general we already have articles on most of the nominally heretical doctrinal points which lead groups to be not accepted as non-heretical, but the matter is still a relevant one.