Seems as tho there were numerous groups outside of the Catholic church that called themselves Christians during the time period you posted...Of course to you, they are known as heretics...The Catholic church wasn't the only game in town...
Assuming you acknowledge that the Protestant Reformation began as the result of Luther, Calvin and others leaving the Catholic Church,
I'm convinced that the first Christians out of Antioch for the first few hundred years, had someone stuck another name on them, would have been called Protestants...I believe as well that the roots of Catholic 'Christianity' was mentioned by Paul...And since your church seems to avoid the apostle Paul like he has the plague, I suspect Paul was referring to your early church here:
2Co 2:17 For we are not as many, which corrupt the word of God: but as of sincerity, but as of God, in the sight of God speak we in Christ.
is it your contention that all Catholics prior to the Reformation are in hell?
I don't believe all Catholics in any time frame go to Hell...Many I'm sure, accept salvation without works as the 'free' gift from Jesus Christ in spite of your church...I fear that your church's teaching will send millions to Hell...
So you don't even acknowledge that the Protestant Reformation originated when men such as Luther and Calvin broke from the Catholic Church?