Editor wars are usually fought between the devotees of Emacs and vi, the two most popular editors on Unix. Frequently, at some point in the discussion, someone will point out that ed is the standard text editor.
The Church of Emacs has been formed by Emacs users, to worship Emacs and discourage the use of vi. It has its own newsgroup, alt.religion.emacs. Richard Stallman has declared himself to be St IGNUcius, a Saint in the Church of Emacs.
vi lovers have created an opposing Cult of vi, which some Emacs users call "clearly a miserable attempt to ape their betters."
Links:
http://www.dina.dk/~abraham/religion/ -- Church of Emacs resources
http://stallman.org/saint.html -- Saint Ignucius
http://www.splange.freeserve.co.uk/misc/vi.html -- wherein you might encounter Venom Incarnate