In an interview in the October 1991 Ladies’ Home Journal that was advertised as her “most candid” ever, Hepburn said:
“I’m an atheist, and that’s it. I believe there’s nothing we can know except that we should be kind to each other and do what we can for each other.”

Katharine Houghton Hepburn (May 12, 1907 – June 29, 2003) was a four-time Academy Award-winning American star of film, television and stage, widely recognized for her sharp wit, New England gentility and fierce independence. Her career spanned seven decades.
(From Wikipedia and celebatheist.com)