I would suggest you find some, get to know them better, and then ask them. Barring that, I suggest you go with what you typed above, until you get agreement on something less strenuous to type. You see, I'm not them, and IMO it's bigotry to assume that all of us non-Catholic/Orthodox types are all alike, that we're all "Protestants", or that the sins of a few can be blamed on all who look like them. Such beliefs I would label as "Anti-Protestantism".
In short, I don't buy in to the silent assertion of this thread's article. I refuse to believe that bigotry is okay for any group to commit. Some of the reactions to the article have been, to say the least, interesting.
BTDT. The answer is often that they are "simply Christian". That sort of response comes up frequently enough even on this forum. Trouble is, "A" disagrees with "B" on some point, and both "A" and "B" insist that "C" is a blasted heretic. And if asked, I would say that I'm "simply Christian". (think about it). So that's not particularly useful. Worse, when one finds reference to one of these independent communities in the news, or elsewhere, sorting them out can be a practical impossibility. What to call them? I have, so far, IECIDIO, and blitiri. Both of which I came up with.
Go back and read EVERYTHING I've ever written on these threads. I think I used the term "heretic" once and apologized soon after. I've never used the term "Prots" (or any form thereof). And I have stated many times that I consider Martin Luther to be a fascinating man and I have read a lot of his writings.
As I noted earlier, ANYONE who reads this article and thinks that it is only an attack on Catholicism is being dangerously myopic. The left's goal is to destroy Christianity plain and simple. The left knows that to accomplish that, they must destroy Catholicism simply because we are by far the largest branch of Christianity. The author of this article opines that most Catholics are in disagreement with the Church over moral issues like abortion -- do not presume for a second that the author would not like to say the same thing about ALL Christians. There are a vast number of FReepers who I have had fierce debates on Catholic issues, even though we both understand that on critical moral subjects we are in total agreement.
I tend to use the term "'reformed' Christians." It points to the fact that all of these groups are derived from the "Reformation."