DNA neither cares nor knows. DNA just is. And we dance to its music. - Richard Dawkins

Imagine, with John Lennon, a world with no religion. Imagine no suicide bombers, no 9/11, no 7/7, no Crusades, no witch-hunts, no Gunpowder Plot, no Indian partition, no Israeli/Palestinian wars, no Serb/Croat/Muslim massacres, no persecution of Jews as ‘Christ-killers’, no Northern Ireland ‘troubles’, no ‘honour killings’, no shiny-suited bouffant-haired televangelists fleecing gullible people of their money (‘God wants you to give till it hurts’). Imagine no Taliban to blow up ancient statues, no public beheadings of blasphemers, no flogging of female skin for the crime of showing an inch of it.

It is very good that Wikipedia also gives a page to "Internet Meme". Internet memes are arguably the most important subset of memes today

Many of us saw religion as harmless nonsense. Beliefs might lack all supporting evidence but, we thought, if people needed a crutch for consolation, where's the harm? September 11th changed all that.