Is there a breakdown of the 'other religion' category? Exactly what religions and populations.
Not yet. The most detailed breakdown available is here http://cso.ie/en/media/csoie/census/doc ... Tables.pdf
but it still leaves 14,118 people unaccounted for. The full details will be released in October.
We can surmise that as the smallest stated religion (Brethren) has 336 adherents, each of the religions lumped together had fewer. Other Christian religions were counted separately, so therefore, if the CSO has followed best practices, there are at least 42 other non-Christian religions represented in the state and likely three or four times that number (assuming the numbers tail off in a statistically reasonable manner). Personally, I'm skeptical and I think they're fudging the numbers in some way.
One thing I've just spotted: Two religions experienced unusually large changes. The population of Orthodox more than doubled, while the population of Methodists almost halved. Now I can just about imagine that 24,000 Orthodox Christians moved here in the last five years but why did 5,300 Methodists leave? The answer seems to be that in the 2006 census Methodist was listed as an option, and it was removed in 2011, while Orthodox was not there in 2006 but was added in 2011. It seems all but certain that the layout of the question had more influence on these numbers than any demographic change. I suspect that when their religions were not listed, many adherents simply wrote "Christian". This is significant because one of our arguments is that the way the question is presented influences the results and this seems to prove as much.