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.
This book is a HUGE disappointment due to its blatant prejudicism that starts in the first few pages. True Christians, and God especially, do NOT hate people because they are different, and yes, gays are born that way. It is NOT a choice. I could scarcely believe the garbage Carol Fitzpatrick allowed in this, and now that I've warned others about it, it's going straight to the garbage!