Over the past two centuries the Christian faith has spread to all continents. Although more global than ever, Christians are religious minorities in most societies. Religious freedom is hardly universal. In the past fifty years, millions of people have been uprooted from their traditional homelands in Asia, Africa, and Latin America. Some have emigrated to Western Europe and North America. The West has become the scene of cultural, linguistic, and religious variety on a scale unimagined in 1900. Today, the full range of faiths and religious practices from all continents are present in Europe...