I had many extended debates with the former Serbian Catholic turned antagonistic agnostic, and do not recall seeing any Catholics except one (rarely seen here) really contend with him, while other Catholics agreed and worked with him despite him being one who posted attacks against basic Bible teaching and its God as well as being in critical rejection of Catholic doctrine.
Thus criticizing Protestants for being aligned so with some who disagree on core truths (which i have rarely seen evident) is somewhat inconsistent. And i have debated Calvinism and the Trinity with other Prots.
But like as we rarely see Catholics debating each other in threads regarding Prot. vs Catholic issues, but which do take place sometimes on threads dealing with that, so also debates btwn Protestants also have taken place on threads regarding divisive Protestant issues.
But the reason these are not often seen is because they are not pushed, in contrast to the near constant threads promoting Catholicism and attacking evangelicals.
I call you out on this as well. Firstly, should we consider Swedenborgians or Unitarians or Jehovah's Witnesses as Protestants?
Secondly, if they bring up a point on any thread you'all are on that says to the effect that the Trinity is a man-made construct, wouldn't or shouldn't you'all object? But no....not a whisper --> in contrast as given above, when Kosta's view was against orthodoxy, I called him out.