(RNS) — Child orator. Farmhand. Agnostic. Only one of those titles would be commonly guessed to describe the Rev. Martin Luther King Jr. But a new 420-page book by scholar Lerone Martin reveals those and other little-known pieces of King’s history. In “Young King: The Making of Martin Luther King Jr.” — which will be released Tuesday (May 5) — he describes the family, friends and educators who helped shape King into the man who would one day dra…