Warren G. Harding was a Baptist.
From: Peter Roberts, "Warren Gamaliel Harding" page in "God and Country" section of "Science Resources on the Net" website (http://www.geocities.com/peterroberts.geo/Relig-Politics/WGHarding.html; viewed 29 November 2005):
Religious Affiliation: Baptist
"It is my conviction that the fundamental trouble with the people of the United States is that they have gotten too far away from Almighty God." -- 1920
"Standing in this presence, mindful of the solemnity of this occasion, feeling the emotions which no one may know until he senses the great weight of responsibility for himself, I must utter my belief in the divine inspiration of the founding fathers. Surely there must have been God's intent in the making of this new-world Republic. Ours is an organic law which had but one ambiguity, and we saw that effaced in a baptism of sacrifice and blood, with union maintained, the Nation supreme, and its concord inspiring. We have seen the world rivet its hopeful gaze on the great truths on which the founders wrought. We have seen civil, human, and religious liberty verified and glorified. In the beginning the Old World scoffed at our experiment; today our foundations of political and social belief stand unshaken, a precious inheritance to ourselves, an inspiring example of freedom and civilization to all mankind. Let us express renewed and strengthened devotion, in grateful reverence for the immortal beginning, and utter our confidence in the supreme fulfillment." -- Inaugural Address, 4 March 1921
"In the experiences of a year of the Presidency, there has come to me no other such unwelcome impression as the manifest religious intolerance which exists among many of our citizens. I hold it to be a menace to the very liberties we boast and cherish." -- address, 24 March 1922