Here is a link to the summary of an article on the changing landscape of religions. This is a synopsis of work done by Vegard Skirbekk et al. and was mostly carried out at the International Institute for Applied Systems Analysis (IIASA), based in Laxenburg near Vienna, Austria.
Religion is a key factor in demography, important for projections of future population growth as well as for other social indicators. A new journal, Yearbook of International Religious Demography, is the first to bring a quantitative demographic focus to the study of religion. The journal is co-edited by IIASA researcher Vegard Skirbekk, an expert in the field of religious demography. The first edition of the journal includes three studies by IIASA researchers:
Read more at: http://phys.org/news/2014-08-landscape-religion.html#jCp
aviott 
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