article_snippet.sent: Click on the graphic below for a breakdown on each country .
article_snippet.sent: Pope Francis is pictured in Tirana, Albania last year .
article_snippet.sent: Washington DC's Pew Research Center and Austria's International Institute for Applied Systems Analysis spent six years gathering the data from 2,500 censuses and surveys.
highlights_snippet.sent: Statistics have been revealed by Washington DC's Pew Research Center .