OMF International ( or Overseas Missionary Fellowship and China Inland Mission before 1964 ) is an inter-denominational Protestant Christian missionary society . It was started by English missionary Hudson Taylor on 25 June , 1865 . OMF International ( formerly Overseas Missionary Fellowship and before 1964 the China Inland Mission ) is an interdenominational Protestant Christian missionary society , founded in Britain by Hudson Taylor on 25 June 1865 .