"J," "P," "E," and "D" are the names scholars have given to some authors of the Bible, and, as such, they are very important letters to a lot of people. Churches have died and been born, and millions of people have lost faith or found it, because of the last two centuries of debate about who, exactly, wrote the canonical texts of Christianity and Judaism. Richard Elliott Friedman"s survey of this debate, in Who Wrote the Bible?, may be the best written popular book about this question. Without condescension or high-flown academic language, Friedman carefully describes the history of textual criticism of the Bible--a subject on which his authority is unparalleled (Friedman has contributed voluminously to the authoritative Anchor Bible Dictionary). But this book is not just smart. Perhaps even more impressive than Friedman"s erudition is his sensitivity to the power of textual criticism to influence faith.