Religion in developed countries is declining—but why so fast? In the coming years, it is estimated that 9 countries will be comprised entirely of non-believers.

We have seen a significant decline in religious belief in most developed countries. For example, the U.K. took just 10 years to make a full u-turn from being a country comprised mostly of religious believers to a country predominantly made up of non-believers.

Even in the USA, a country known for being very religious, we see this decline in religious practice. From 1990-2008, the percentage of Christians in the population fell from 86.2% to 76%.

As our societies change and develop, so too must our understanding of them. So why is it that our developed countries are seeing such a dramatic fall in religious adherence?