DON RICHARDSON, author of "Peace Child, Eternity in Their Hearts "and "Secrets of the Koran, "has been studying the Muslim world for more than 30 years. He and his wife, Carol, spent 15 years among the Sawi, a Stone Age tribe of Irian Jaya. Don designed an alphabet suited to the Sawi language, authored 19 primers, taught the tribesmen to read in their native tongue and translated the entire New Testament. More than half of the Sawi accepted Jesus Christ as their Lord and Savior. Since 1977, Don has served as ambassador-at-large for World Team, a mission organization. Don holds an honorary doctorate of literature from Biola University in La Mirada, California, is an ordained pastor and speaks at more than 40 church conferences each year.