Chester A. Arthur was an Episcopalian, a member of the Episcopal Church, which is the American province of the Anglican Communion.
Chester Arthur was the son of a Baptist minister.
From: Peter Roberts, "Chester Alan Arthur" page in "God and Country" section of "Science Resources on the Net" website (http://www.geocities.com/peterroberts.geo/Relig-Politics/CAArthur.html; viewed 29 November 2005):
Religious Affiliation: Episcopalian
Summary of Religious Views:
As a result of a religious experience, Arthur's father became a Baptist minister, but Arthur doesn't seem to have shared his father's faith. Arthur sometimes attended church, generally favoring Episcopal services. Franklin Steiner, in his book The Religious Beliefs of Our Presidents, categorized Arthur among "Presidents Whose Religious Views Are Doubtful."