Analysis of information sources in references of the Wikipedia article "Irreligion in the Republic of Ireland" in English language version.
This was an increase of 63% since the 2016 census, and of 187% since the 2011 census.
The number of people with no religion increased across all age cohorts.
persons [who] stated that they had no religion (including atheists/agnostics) [..] were the second largest category and made up 10.1% of the population, compared with 6.0% five years previously
up from 5.9 per in 2011 [..] making 'No Religion' the second largest group in 2016
The mirror reverse of this pattern can be largely seen for those indicating no religion, with an initial low of 4.5 per cent for 12 years olds, rising to a peak of 18.5 per cent for those aged 26 before declining as the population ages.
Figure 4.3 illustrates the proportional breakdown of the population by broad religion and age group in 2011 and 2016.
Figure 8.3 Proportion of students by education level with no religion, 2011-2016
Up to 45pc who class themselves as having no religion are in the 20-39 age bracket.
The age group 20-39 accounts for 28 per cent of the general population but 45 per cent of those with 'no religion' fall into this age bracket.
The unaffiliated portion of the adult population ranges from as high as 48% in the Netherlands to 15% in Ireland, Italy and Portugal.
The report also states that there has been a much smaller drop in regular church attendance (monthly or more), which has fallen from 33% to 28%
the share of [Irish] voters attending church monthly or more declined from 80 percent in the 1990s to 28 percent by 2020
