Created by two of the field's leading experts, this unique introduction to international religious demography outlines the challenges in interpreting data on religious adherence, and presents a contemporary portrait of global religious belief. Offers the first comprehensive overview of the field of international religious demography - detailing what we know about religious adherents around the world, and how we know itExamines religious freedom and diversity, including agnostics and atheists, on a global scale, highlighting trends over the past 100 years and projecting estimat