|Breda Heffernan and Colm Kelpie|
Only Vietnam has seen a bigger drop in people declaring themselves to be religious over the past seven years, a period when the Catholic Church in Ireland has been rocked by sex-abuse scandals and a crisis of leadership.
Red C interviewed more than 51,000 people worldwide, including just over 1,000 people in the Republic.
An overwhelming 69% of Irish people declared themselves to be "a religious person" in the last survey conducted in 2005, but this has now plummeted to 47%.
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