This reminds me of (note: I’m not saying it’s the same as… just that it happens to remind me) someone here back when I was still Catholic telling me I was not really Catholic because I admitted I was not absolutely certain the Orthodox Church was not true, I was only certain that Protestantism is not true. I understand this is a tangentially related question to OP, but… how does this not destroy the visiblity of the church, if someone who is visibly a member of the church is actualy not a member of the church due to possessing doubt? I understand that you could say the visibility of the church is damaged because of Vatican ii or the fact that an antipope is in Rome or something like that. But I kind of just intuitively doubt (and I admit I can’t prove this) that all or even nearly all pre Vatican ii bishops consistently formally excommunicated anyone who had any degree of doubt about any dogma, maybe someone who obstinately denied it or publicly went around denying it, but not merely a person who simply wasn’t as certain as they should be about it. Basically I’m hinting at the opposite problem to the one you’ve often mentioned (and I see your point) about “non feeenyite” ecclesiology logically leading to Vatican ii and a sort of franken church that only subsists in the Catholic Church, but also include includes non-catholic. Saying that people who are visibly and publicly identified in the Catholic Church are “not Catholics” because of some interior doubt or disposition seems to logically be the other side of the same coin. Thoughts?
So doubt precludes the profession of faith, and profession of faith, or, rather, faith itself, requires absolute certainty. There cannot be supernatural faith that admits of any doubt. I may have been the one to tell you that if you're not sure about Catholic vs. Orthodox that you do not have the faith and are already outside the Church.
So, the visibility of the Church consists of four criteria: 1) visible / physical membership via the Sacraments, 2) outward professoin of the true faith, 3) public professoin of submission to he Supreme Pontiff, and 4) non-excommunication. If any of those is missing, there's no membership in the Church. In doubting about 2 vs. 3, you were failing criteria 2 & 3.
Now, pre-V2 bishops would not excommunicate those who had any doubt about dogma, especially if these doubts were of the private variety. If they were in PUBLIC doubt, and/or could potentially be influential, where some individual were doing harm to souls ... that might have warranted excommunication, but that was rarely teh case. When people doubted the Church, it just took care of itself, where they left.