‘The Twilight of Atheism: The Rise and Fall of Disbelief in the Modern World’ by Alistar McGrath analyzes and seems to suggest that atheism being in decline.
The Washington Times has an article (from March 2005, so it maybe a bit outdated).
‘American Thinker’(also from March 2005, I think they maybe all linked) also suggests that atheism is in decline, and ‘re-paganization’ is surging.
‘Investigating Atheism’ website suggests that ‘Worldwide atheism is in decline, but as Zuckerman also points out this has partly at least been attributed to the fact that ‘highly religious nations have the highest birth rates in the world, and highly irreligious nations have the lowest’ ones.’
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