By HRVOJE HRANJSKIThe Associated PressSunday, August 24, 2003; 5:16 PM TIKRIT, Iraq - With war and death on his mind, Spc. Barry Page was baptized Sunday in the Tigris River by an Army chaplain at the sprawling U.S. military headquarters on the fabled river's banks. A Southern Baptist working as a military policeman, Page said he decided to "reannounce his life to Christ" in the birthplace of civilization. "I realized death is walking in this place," said the 22-year-old from Houston, his uniform and boots soaking wet. "It can be any of us. Next time it could be me." The...