Emacs was originally an extensible text editor written by Richard Stallman, but it became a way of life and a religion. To join the Church of Emacs, you need only pronounce the Confession of the Faith:
There is no system but GNU, and Linux is one of its kernels.
Sainthood in the Church of Emacs requires living a life of purity—but in the Church of Emacs, this does not require celibacy (a sigh of relief is heard). Being holy in our church means exorcizing whatever evil, proprietary operating systems have possessed computers that are under your control, or set up for your regular use; installing a holy (i.e., wholly) free operating system (GNU/Linux is a good choice); and using and installing only free software with and on the system. Note that tablets and mobile phones are computers and this vow includes them.
Join the Church of Emacs, and you too can be a saint!