I'm going purely off of what I have heard from my mother...they were both Catholics, on the census too....but they were for some reason married in a Church of Ireland Church in Dublin...the children were raised in that faith as far as I know, with classic Irish Catholic names...they were all born and raised in County Wicklow...believe me it puzzles me too. My grandmother married my grandfather a Catholic, a devout Catholic untill she died, buried as one too.