I'm not endorsing the religion, and I'm not religious myself. However I did attend a Seventh Day Adventist high school, and for several years, church, and the community aspect is something I dearly miss. Knowing that every Saturday you'll go hang out with friends and chat and maybe go to the beach and generally take it easy was really nice. It was also the sort of place you could go and know nobody would accuse you of delusional biases, unlike online communities like HN.
I'm a doubtful agnostic these days, but people who've never been could try talking to churchgoers to discover their motivations. Seeing friends and knowing it's a pretty safe place are big draws.
Of course, I was pretty lucky to be at, by SDA standards, a _very_ liberal church, and straight. I also had a good secular and Catholic education before attending the SDA school, which had horrendous standards (and creationism). And I now live in a place where the horrors of a state religion are laid bare - google "babies" and "septic tank".
But there are big positives that are hard to replicate. I also really miss the "I. Do. Not. Work. On. The. Sabbath." (standard disclaimer forfirefighters, emt, etc) side of things. Everyone here who has burned out might appreciate the idea of one day reserved for family, friends, and reflection.
Also, c'mon, a person following a vegetarian diet is at _least_ paying more attention to what they eat then most, and animal fats are not particularly healthy. Comparing to the best diets including animals (basically fish heavy ones) doesn't mean that vegetarian isn't better than the standard western diet.