Eurostat's Eurobarometer survey in 2015, found that 27.0% of the adult population declared themselves as agnostics or non believer, while 34.1% declared themselves as atheists.
The Eurobarometer survey conducted by Eurostat in 2015 revealed that a significant portion of the European adult population identifies as agnostic or non-religious, with 27% falling into this category. Additionally, 34% of those surveyed identified as atheists.