JOHANNESBURG (Reuters) - Blood from sheep butchered in a religious ritual at one of South Africa's busiest tourist beaches could tempt sharks toward bathers, an official warned Thursday. A small group called the Healing Oracle has carried out such sacrifices on a beach in the eastern coastal city of Durban, media reported. Its leader Prophet Moses Michael said it was inspired by the Old Testament to help cure sick people. But biologist Sheldon Dudley of the Natal Sharks Board, which aims to reduce attacks on humans, said the blood may attract sharks even though the beach is protected by nets....