From an article in the Danish magazine "Indland" (translated by Google Toolbar, but readable.)

(Article from Thistle, Google toolbar operated by Leo9)
Denmark is the world's least religious country

By Lasse SHUTTLE

Published at 24.09.10. 20:50

Only every fifth Dane considers religion as an important part of everyday life.

A new Gallup poll shows that religion plays a crucial role in the daily lives of 84 per cent. of the planet's population.

But not with the Danes.

Here is the picture turn completely reversed - 81 per cent. of Danes consider not religion as an important part of their everyday lives.

And that makes Denmark the world's least religious country in the world along with Estonia (84 per cent.) And Sweden (83 percent)..
Poorest countries are most religious

The survey, conducted during 2009, based on interviews with adult residents in 114 countries. And the main conclusion is that religion fills most of the poorest nations.

Thus is poor countries like Bangladesh, Indonesia, Sri Lanka and Yemen top the list. Around 99 per cent. people of the countries have religion as an indispensable aspect of their lives.

"One theory is that religion plays a more functional role in the world's poorest countries, where faith helps people to cope with the daily struggle to support themselves and their families. A former Gallup analysis supports this idea. Last year we completed the following a three-year analysis that showed that the relationship between religiosity and emotional well-being is strongest in poor countries, "said Gallup editor Steve Crabtree.
U.S. stands out

United States differs markedly from the usual picture. The country is among the richest countries in the world, but still indicates 65 per cent. of Americans that religion is important in their daily lives.

Other high income countries, where religion is considered as important, are Italy, Greece, Singapore and countries in the Persian Gulf.
It's a common experience that interest in formal religion falls as a country gets more prosperous, but the exceptions are more interesting than the rule. My guess would be that the key index is not prosperity in the crude measure of GDP or average income, but material security. Denmark and Sweden, despite falling victim to voodoo economics in recent years, have a history of being leaders in the welfare state. I suggest that the counter-examples are countries where, despite a high GDP, a weak welfare or social security system or an uncertain job market undermines the average citizen's security in life.

Considering that Scandinavia has such a solid Asatro movement, it would be fascinating if they could refine the study to distinguish between established religions and private spiritualities. I suspect that a lot of people who marked "religion unimportant" simply meant they didn't go to church (or mosque or temple).