“I thought that there was no such thing as *Roman Catholic* that it was just Catholic”
Correct.
“and *Roman Catholic* was a Protestant construct......”
Correct. But, since this is an English speaking Protestant country, “Roman Catholic” has the force of law to it since it is so grounded in 450 year old English Protestant bigotry.
What martyrs.......
They were FORCED into using it?
Not.....