In the "Other Stated Religion" map, four constitutencies outside the Greater Dublin area stand out in brownish colour. Thre of them are adjacent to Northern Ireland, so I assume its Protestants there.
But what about the coastal strip south-west of Cork? Hippie-land with lots of Celtic Druids and converted Buddhists? Or English, German and Dutch immigrannts working for the local tourism business?
I believe there's a bit of a Protestant tradition in Kerry, at least stronger than elsewhere in rural Ireland.