RE: As for their followers, that would be those who openly professed such doctrines.
There are MILLIONS of Luther and Calvin followers now who OPENLY profess their doctrines.
Luis Palau being one of them ( ask him for instance if he believes in Sola Scriptura, I am 100% certain he would say YES. Why do I say that? I heard him say so before ).
Ask Palau directly if he believes that Pope Francis should be THE ( not ‘a’ ) representative of Christ on earth. If he were honest to his Evangelical Heritage, he would say Francis is ‘a’ representative, but not ‘the’ representative of Christ.
Vatican I condemns that belief, but Vatican II does not.
To be consistent with your statement ‘As for their followers, that would be those who openly professed such doctrines.’, men like Palau would be under Vatican I anathema ( bit not Vatican II ).
Not really. Not many even know what the teachings of Luther and Calvin were. And the consequence of their actions was a Christianity divided literally into warring camps, the devastation of Europe, and the discrediting of Christianity in such a way as to open the door to the new paganism that threatens us now.