<p>Satan worship. Witches. New Age channelers.<br>The last two decades of the twentieth century witnessed a vast upsurge in occult activity. Scores of popular books have warned Christians of the dangers and urged them to do battle against these spiritual forces. Few books, however, have developed a careful biblical theology on demons, principalities and powers.<br>Clinton Arnold seeks to fill this gap, providing an in-depth look at Paul's letters...