Meh, protestants can be Irish too. Even Unionist ones - whether they like it or not.
Yup.
Wolfe Tone, McCracken, Russell, Orr, Lord Fitzgerald, Napper Tandy, Nelson in 98.
Emmet brothers, Hope 1803.
Gray, Haughton, Davis, Mitchell, Smith O'Brien the Young Irelanders.
Butt, ParnellShaw, Gray, Glynn, Harrison, Jordan, Mcdonald, MacNeill, Maguire, de Lacy O Mahony, Pinkerton, Plunkett, Young, Home Rule movement.
Sam Maguire (yes the All Ireland Football trophy is named after him), Hobson, Markievicz, Casement, Childers, White, Edward O Brien, Stopford Green, Figgis, Miles, Meredith, Barton Robinson, Macardle, 1916-22 period.
Douglas Hyde was the first President. Erskine Childers junior became President in 1973.
Denis Ireland, John Graham, George Gilmore and George Plant in the 40s.
I will leave it there but there have been many more. Being Irish does not equate with being of a particular religious denomination.