This study is not a chronological account of Protestantism as one manifestation of the Christian religion but a topical one dealing with various aspects of the phenomena of Protestant churches, their beliefs, actions, and culture. The scope of the work includes world Protestantism since although European in its origins, Protestant stress upon missions has given it worldwide dissemination. The opening chapter of the book gives a concise and informative survey of the world map of Protestant churches, concluding paradoxically that the Protestant world is becoming both smaller (in the presence of secularizing tendencies throughout the world) and larger, as ecumenical attitudes and activities lead to shared interdenominational experiences. The body of the book takes up such topics as the formation of Protestant thought, the theological questions of God's relations with men, the Biblical bases of Protestant life, and the expression of that life in the context of the modern world. With respect to the future of Protestantism, Professor Marty is not very optimistic. Noting that there are now more American missionaries abroad than ever before, he points out that there are preponderantly more from the Pentacostal and fundamentalist sects. Neither the ecclesiastical nor the cultural prospects for Protestantism seem promising at this point. The book compresses a great range of information and interpretation within its compass and the extensive annotated bibliography gives evidence of the scholarship invested in it. At the same time, its clear and direct style make it readily available to the lay reader. This volume is one in the publishers' outstanding ""History of Religion"" series.