As I am sure you are aware, Catholics would regard most of the groups you listed as fellow Christians, and therefore part of the Body of Christ.
But because of the nature of the Church, it’s not as if simply being a Christian means one is fully participating in the life of the Church.
So individual Protestants are certainly part of the Church, but they are estranged from the Catholic Church, in a sense. That’s what the whole deal is with the “ecclesial community.” I know that sounds very offensive, and it’s not the best idea, simply because the word “church” has it’s own connotations that aren’t technical. But the point is that groups of Protestants are groups of Christians, but their visible institutions aren’t Catholic, because they are setting up their “chairs” outside the visible communion of the church, to use Cyprian of Carthage’s language.
I’m sure there is something analogous in your beliefs. I’m assuming you would agree that there are some Protestant groups that are closer to the truth than others, right? Some Protestants get Eucharist wrong, some get it right.
Our difference is how we know where this boundary is — how we know where the fullness of the Church is. And did Christ want us to know? Did he want to provide us this fullness? Catholics, of course, say that his shepherds that act in his stead on Earth, the bishops united in Peter, are visible signs of the communion of the Church. For it is around them that the Eucharist is celebrated, and it is around them that the Tradition of the Faith is passed on, guarded, and interpreted.
I wish we had Lutheran, Anglican, Methodist, etc. Rites, Orders, liturgies, even theological traditions. I think it’s possible to have. It’s just the visible unity Christ willed for is currently lacking in his Body. There is a way for all to be united, and I think Christ has provided the means already: His Holy Spirit, the Eucharist, Apostolic Succession, the office of the Bishop of Rome, and so on…