William Blount was a Presbyterian and an Episcopalian.
He was identified as an Episcopalian by the Library of Congress. The North Carolina State Library and A Worthy Company: Brief Lives of the Framers of the United States Constitution by M. E. Bradford were cited as the sources stating he was later a Presbyterian. (Source: Ian Dorion, "Table of the Religious Affiliations of American Founders", 1997).
From: Robert G. Ferris (editor), Signers of the Constitution: Historic Places Commemorating the Signing of the Constitution, published by the United States Department of the Interior, National Park Service: Washington, D.C. (revised edition 1976), pages 146-148:
Planter and land speculator Blount, who played an insignificant part at the Constitutional Convention, carved out a career in North Carolina and Tennessee as well as in national politics. It was marred, however, when he earned the dubious distinction of being the first man to be expelled from the U.S. Senate...
In 1796 he presided over the constitutional convention that transformed part of the Territory into the State of Tennessee. He was elected as one of its first U.S. Senators (1796-97).
During this period, Blount's affairs took a sharp turn for the worse. In 1797 his speculations in western lands led him into serious financial difficulties. That same year, he also apparently concocted a plan involving use of Indians, frontiersmen, and British naval forces to conquer for Britain the Spanish provinces of Florida and Louisiana. A letter he wrote alluding to the plan fell into the hands of President Adams, who turned it over to the Senate on July 3, 1797. Five days later, that body voted 25 to 1 to expel Blount. The House impeached him, but the Senate dropped the charges in 1799 on the grounds that no further action could be taken beyond his dismissal.
The episode did not hamper Blount's career in Tennessee. In 1798 he was elected to the senate and rose to the speakership. He died two years later in Knoxville in his early fifties. He is buried there in the cemetery of the First Presbyterian Church.
Note that numerous sources and authoritative references have been consulted in order to ascertain the religious affiliation of the American Founding Fathers. Note that the excerpts and references mentioned on this page are not the only references used in order to identify this person's religious affiliation.