KNOXVILLE, Tenn. (AP) — Dr. John Gordon, a reproductive endocrinologist, has been a man of faith for years. When he began to have doubts, they were not about his God, but his life’s work. He chose to be an infertility specialist to help people. Thirty years later, scientific advancements made that easier than ever but created more ethical dilemmas . As co-director of a fertility clinic in suburban Washington, D.C., Gordon grew troubled over helping create surplus embryos, which would often