John Lansing, Jr. was a member of the Dutch Reformed Church.
From: Political Graveyard website (http://politicalgraveyard.com/bio/ellsworth.html#R9M0IW34R; viewed 7 December 2005):
Lansing, John, Jr. (1754-c.1829) - of Albany, Albany County, N.Y. Born in Albany, Albany County, N.Y., January 30, 1754. Uncle of Gerrit Yates Lansing. Member of New York state assembly from Albany County, 1780-84, 1785-87, 1788-89; Delegate to Continental Congress from New York, 1785; mayor of Albany, N.Y., 1786-90; member, U.S. Constitutional Convention, 1787; Justice of New York Supreme Court, 1790-1801. Christian Reformed. Mysteriously disappeared in New York City, December 12, 1829, after leaving his hotel to post a letter, and was never found. Cenotaph at Albany Rural Cemetery, Menands, N.Y.
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.