Riley once claimed that he was riding on a bus just in front of this actress and noted atheist. This actress essentially slowed her career after the 1940s when she grew tired of playing racial stereotypes. Born with the first name "Thelma", she later legally changed her first name to that of her given nickname, a nickname a lepidopterist would approve of, and one given for her performance of a particular ballet in a 1934 production of A Midsummer Night's Dream. Identify this actress whose best known role was as the maid Prissy in Gone With the Wind, a role in which she famously delivered the line "I don't know nothin' 'bout birthin' babies!"
Butterfly McQueen