Aaron Burr was a Presbyterian.
Aaron Burr was the son of the prominent Presbyterian clergyman who was a founder of Princeton University.
From: Peter Roberts, "Aaron Burr" page in "God and Country" section of "Science Resources on the Net" website (http://www.geocities.com/peterroberts.geo/Relig-Politics/ABurr.html; viewed 23 November 2005):
Religious Affiliation: Presbyterian
Summary of Religious Views:
Burr's father was a minister, and, although his father died when he was 3, Burr was raised in a strict religious environment. After graduating from college, Burr studied briefly for the ministry, before choosing the law as his profession.
A minister was present during Burr's last days, but Burr, who was alert, lucid, and able to communicate until the very end, though he was hospitable to the clergyman, did not request, and was not given, the holy sacrament.