Book excerpt: What theologies are popular and formative of Christian thinking in the present day? How should they be assessed by those Christians who want to be "in the world" without being "of the world"? Theologies of the 21st Century begins with an overview of the historical roots from which current theological thinking has developed, and then moves on to a detailed evaluation of the chief doctrinal and practical emphases, taking an evangelical biblical perspective that seeks to be at once both critical and irenic.