I'm surprised I have to spell this out to someone who writes software for a living, but about 50,000 people total go to Burning Man every year, a subset of which are software engineers. There are something like 500,000 software developers in the country. If fully half of Burning Man's attendees were practicing software developers that would still only be 5% of all developers (of course, nowhere near half of Burning Man attendees are practicing software developers).

Meanwhile, 40% of Americans regularly attend church (FWIW: I am not one of them, though I am sort of idly Catholic). If developers were 1/4th as likely to regularly attend church as other Americans (a stretch, though it might not seem that way if all the developers you know are San Francisco twentysomethings, but I'll stipulate that it's possible) than, meeting a random software developer on the street, you are talking to someone who is twice as likely to attend church as burning man.