We refer to such folks as "separated brethren." The "the glass is half empty" crowd get all upset about that, but I want to stress that in saying "brethren" we are saying precisely what you WROTE thatyou wanted us to say.
However, since there are those who disagree on major points of sacramental theology and on matters concerning spiritual charisms, it would be a kind of white wash, even a sort of disrespect to fail to acknowledge the division on matters of doctrine. Therefore the use of the adjective "separated."
You ought to consider that some of us are not going to take it laying down when we are told that we are a special kind of heretic for leaving the Catholic Church and will be guaranteeing ourselves a place in hell for that.
And I’ve been told that not only by some FRoman Catholics just in the last couple months, but have been told that by Catholics I worked with.
It is not normal Roman Catholic mentality to consider those outside the Roman Catholic Church as brethren. There is a greater level of tolerance for those of more Orthodox persuasion. They are more the ones I’ve heard referred to as separated.
But Protestants? Not so much. Matter of fact, rarely.
I have no screaming problem with the term.
We ain’t all in the same bathtub, thankfully.
LOL.