James McHenry was a devout Presbyterian.
He was identified as a Presbyterian by: the Library of Congress and A Worthy Company: Brief Lives of the Framers of the United States Constitution, written by M. E. Bradford. (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), page 189:
McHenry returned to his estate near Baltimore and to semiretirement. He remained a loyal Federalist and opposed the War of 1812. He also held the office of president of a Bible society. He died in 1816 at the age of 62, survived by two of his three children. His grave is in Baltimore's Westminster Presbyterian Cemetery.
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.