Adlai Stevenson was a Presbyterian.
From: Peter Roberts, "Adlai Ewing Stevenson" page in "God and Country" section of "Science Resources on the Net" website (http://www.geocities.com/peterroberts.geo/Relig-Politics/AEStevenson.html; viewed 29 November 2005):
Summary of Religious Views:
Stevenson was raised and educated as a Presbyterian.
From: Political Graveyard website (http://politicalgraveyard.com/bio/stevenson-steward.html#R9M0JDZSI; viewed 29 November 2005):
Stevenson, Adlai Ewing (1835-1914) - also known as Adlai E. Stevenson - of Metamora, Woodford County, Ill.; Bloomington, McLean County, Ill. Born in Christian County, Ky., October 23, 1835. Married, December 20, 1866, to Letitia Green; cousin of James Stevenson Ewing and Sydenham Benoni Alexander; father of Lewis Green Stevenson; grandfather of Adlai Ewing Stevenson II; great-grandfather of Adlai Ewing Stevenson III. Democrat. Lawyer; candidate for Presidential Elector for Illinois, 1864; U.S. Representative from Illinois 13th District, 1875-77, 1879-81; delegate to Democratic National Convention from Illinois, 1892; Vice President of the United States, 1893-97; defeated, 1900; candidate for Governor of Illinois, 1908. Scotch-Irish ancestry. Member, Council on Foreign Relations; Freemasons; Phi Delta Theta. His grandson, McLean Stevenson, was an actor who played Col. Blake on the television series "M*A*S*H". Died in Chicago, Cook County, Ill., June 14, 1914. Interment at Evergreen Cemetery, Bloomington, Ill.