VATICAN CITY (Reuters) - Pope John Paul on Saturday stressed that the Roman Catholic Church believed abstinence and fidelity within marriage, and not condoms, were the best way to stop the spread of HIV/AIDS. The Pope's words, spoken to a new ambassador to the Vatican, took on an added significance being his first direct comment on the controversial topic since a Catholic official in Spain this week appeared to question the Church's stand against condoms. "The Holy See ... believes prevention through education about the sacredness of life and the correct practice of sexuality, that is chastity and faithfulness, is...