no, linux is the kernel. "free software" is the religion
(but seriously, theres nothing here that could be called a religion, that would be like saying d&d is a religion or a cult because a lot of people like it, or like calling any community a religion. it makes no sense)
Yeah he doesn't have a creepy harem while making promises about wacky rituals granting access to "The Ultimate Repository," while telling you to cut ties with any non-Linux friends. (Yes, even BSD.)
Even free software isn't, because free software delivers objective, non-placebo benefits to people, whether they "practice it" or not. Even when they don't consciously participate or are even aware of it.