Almost one in every three Australians described themselves as having 'no religion' in the country's most recent census, making the group larger than any single religious grouping in the country. 

The 30.1 per cent of Australians who ticked the 'no religion' box include secularists, agnostics and fully-blown atheists. Self-identified Catholics, who make up 22.6 per cent of the population, are the second-largest religious grouping in the country. 

Census data from 2016 confirms a trend that has been many years in the making. Back in 1966, less than 1 per cent of the Australian population reported themselves as having 'no religion'. By 2001, 16 per cent were ticking the 'no religion' box, and by 2011 that figure had increased to 22 per cent.

Although Christianity remains the most common religion in the country - just over half of all Australians identify as belonging to one of the religion's denominations - its popularity has been steadily declining for half a century, from 88 per cent in 1966 to the 52 per cent in the most recent census.