Pesquisa - Os números da religião e do ateísmo no mundo

Fontes: Pesquisas de Phil Zuckerman (2007), Richard Lynn (2008) e Elaine Howard Ecklund (2010), ONU, adherents.com, American ReligiousIdentification Survey, The Pew Research Center, Gallup Poll, The New York Times, Good, Nature, Live Science e Discovery Magazine