Well, until about 1500, there were no protestants really.
Here is a website reporting on Scottish Catholic immigrants to PEI in
the late 18th century (Prince Edward Island, Canada), mentioning
Apparently the most prominant person of that name in the field of
philosophy and ethics at present is Alasdair McIntyre, who is called a
"prominant Catholic intellectual" on one site.
This site lists McI.s von the Canadian 1891 census: they seem to be
mostly protestants of one church or another; towards the end, there
are some RCs, making me wonder if I misread the PEI article.