just a filling piece as I have lived in the area......
the mcerlanes are still plentiful in the Ballyscullion area where Roddy was supposedly betrayed by both the mcerlanes and the duffins. There is an old story in the area of the widow mcerlane stirring the pot of porridge saying it wasn't warm enough - biding her time until the militia came for Roddy. The Mcerlanes still get chided for their part even to this day - its like an unwanted stain on their character.
As to whether Roddy was catholic or protestant - I always heard he was a protestant but from a mixed marriage. His father owned a mill in the Duneane townland (at lismacloskey or milltown) both of which are right beside the COI church he his buried at. Incidentally, I know numerous people who claim to be related to him and all are catholic as are the Mcerlanes and duffins from ballyscullion.