That there are many churches that fall under the label Protestant does not mean that the church body in question is not unified. For example, as a Lutheran, when deciding what is and is not a heretical opinion, I look to the confessions of the Lutheran church. We may not consider it to be infallible, but it will let us know what is and is not a correct opinion, according to the teachings of Scripture.
But others would disagree that the confessions of the Lutheran denominations are “what is and what is not a correct opinion”, or even that they are in accord with Scripture. So this is an impasse, if all different Protestant denominations rely on their own confessions, even while denying that they are God-ordained or authoritative spiritually.
I cannot speak to other Protestant bodies on their ecclesiology. We, however, follow the model layed out by St. Augustine. I can understand why you may consider a visible/invisible church view to be Nestorian. However, it isn’t, since there is no definite split between the two.
I disagree. Some visible “churches” in this view do not have any of the invisible “Church” in them; and then are there many Incarnations just as there are many different “churches” connected to this one amorphous invisible reality? You see, this kind of disordered ecclesiology was one of the reasons I left Protestantism disillusioned, and am now Catholic. I pray for unity, but at the same time I fully acknowledge that there is one Church, and that one Church is the visible unified society of Jesus on Earth, united in faith, the sacraments, under the care of the true successors of the Apostles, the bishops, and under the universal primacy of the Bishop of Rome, from which the unity of the Church comes and “from which sacerdotal unity has its source” (Church Father St. Cyprian).
The visible church is simply that part of the church which we can see, versus that which only God can see, namely, faith. There are tares alongside the wheat. We cannot infallibly tell the difference.
I see it differently, I see the Body of the Church as baptized Catholics, good or bad (wheat and tares) and the Soul of the Church as the Holy Spirit, who acts through the successors of the Apostles, the bishops, especially the Bishop of Rome.
Yes, that’s true viz a vie the laity. I simply used that as an authority referent. My only point being that we both agree that there is only one church, and all validly baptized Christians are part of it (assuming they remain in the faith).
Yes, but validly baptized Protestants are still, from a Catholic viewpoint, in impaired communion with the Catholic Church and are in a damaged relationship. And this is, we believe, only because Baptism is one of the Catholic Church’s sacraments. For Protestant Christians to exist in a repaired state of communion with the whole Church, they must become Catholics.
In other words, baptized persons in Protestantism are in an unnatural state of estrangement from the Church, even while the visible, Catholic sacrament of Baptism has bound them to the Church— even though their communion with the rest of the Church is gravely impaired.