One Incarnate Christianity's Answer to Spiritual Chaos is full of 28 articles by recognized Christian authors, clergy, and laity, who seek ways in which Christians can relate to the postmodern world. Contributors are Christians from several denominations, known for their public profession of the faith. The book is loosely structured along key dates of the church year, especially Advent and Christmas. Each article shows how Christianity relates to society, broadly dealing with philosophy, society and culture, and the Christian faith. All topics point to Christ as the antidote to the present-day, postmodern chaos.
Various is the correct author for any book with multiple unknown authors, and is acceptable for books with multiple known authors, especially if not all are known or the list is very long (over 50).
If an editor is known, however, Various is not necessary. List the name of the editor as the primary author (with role "editor"). Contributing authors' names follow it.
Note: WorldCat is an excellent resource for finding author information and contents of anthologies.