A good take on the conditions which give rise to strong atheism.
Key Quote: "As an ideology, strong atheism tends to emerge under the threat of theocracy. Strong atheism found its public voice in the US under the twin stresses of George W Bush's second term in office and 9/11's demonstration of the worst dangers of fundamentalism."
http://www.guardian.co.uk/commentisfree/belief/2011/apr/12/strong-atheism-origin-religion