Religion in the Republic of Ireland
The predominant religion in the Republic of Ireland is Christianity, with the largest church being the Roman Catholic Church. The Irish constitution says that the state may not endorse any particular religion and guarantees freedom of religion.
Irreligion in the Republic of Ireland
According to a 2012 WIN-Gallup International poll, Ireland had the 2nd highest decline in religiosity from 69% in 2005 to 47% in 2012, while those who considered themselves not a religious person increased 25% in 2005 to 44% in 2012. The poll also showed that 10% of Ireland now consider themselves convinced atheists, which is a vast increase from 2005. This number is thought to be higher due to citizens describing themselves as "cultural Catholics".