How do religious people justify raising and slaughtering animals for food?

[Angrboda]

Wrong!

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Wrong again yog.
All really depends about your body-mind, about your ethnic group and other things as well.
Take many Hindus. For countless generations eat only veg. food and they are ok.
No b12 supplements and yet they are ok. It is all in the mind yog. West medicine know very little about the mind. In the west is a different story. For countless generations peoples eat meat and obviously their bodies takes time to make the change so b12 supplement are important. I follow mother nature system. I see how herbivores do. They eat grass yet their flesh is loaded with b12. Guess why yog?
It is beacause microorganisms are all around the grass so when animals eat the grass they also eat microorganisms that are loaded with b12. I do something similar. When I pick up vegies and herbs from my garden I do not wash them unless they are muddy or dirty after the rain. No need to eat meat yog yet after a life time that I don t eat meat I am quite healthy.

Indian vegetarians are mostly lacto-vegetarians or ovo lacto-vegetarians and dairy products have always been their main source of B12. Also, most Indians accumulate variety of B12-producing gut flora from unclean environments they are exposed to (e.g, uncleaned vegetables, fruits, and water).

That being said, it would be wrong to assume that Indian vegetarians are doing fine for generations. B12 and other nutritional deficiencies are very common in India, more so in vegetarians, especially women, elderly or poor. Many cases of chronic B12 deficiency in Indians are either asymptomatic or undiagnosed.

By the way, you're Australian, not Indian, so the gut flora argument doesn't work for you. All you're accomplishing is exposing yourself to contaminants. Studies show that Indians abroad, removed from their native environment, exhibit high levels of nutritional deficiency.