> As an example, I'm mostly vegetarian (for staying healthy, I'm atheist).

That's a weird qualification to me, as if most other vegetarians do it because of their religion. I don't have any data/stats, but environmental destruction based on our farming practices, and cruelty to animals, both factor a lot higher than religion (has been my experience anyway, but it might be an interesting difference in the US given the deeply entrenched state of religion there).