Irreligion in Azerbaijan is open to interpretation according to differing censuses and polls. Although Shia Islam is the predominant faith in Azerbaijan, religious affiliation is nominal in Azerbaijan and percentages for actual practicing adherents are much lower. It is difficult to quantify the number of atheists or agnostics in Azerbaijan as they are not officially counted in the census of the country. Azerbaijan is one of the most secular states in the Muslim world.
According to a recent Gallup Poll Azerbaijan is one of the most irreligious countries in the Muslim world, with about 53% of respondents indicating the importance of religion in their life as little or none. The same poll indicates that only 20% of the respondents has attended on religious services.