I recall happening upon the song in question on some website devoted to outsider/vanity music; this version of "O Holy Night" is noteworthy in that it does not reference Christ, consisting of a plea for peace. The singer, whose enthusiasm exceeds his polish, sounds like an older man and delivers the song in a New York Yiddish accent.
ETA: Found: it's by Ellis Chadbourne:
http://www.divshare.com/download/13601763-6e4