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

[Angrboda]

In this issue of the Journal, Refsum et al (4) report that ≈75% of a selected urban population from India (Pune, Maharashtra State) had metabolic evidence (hyperhomocysteinemia and methylmalonic acidemia) consistent with cobalamin deficiency [B12] that can only partly be explained by a vegetarian diet.

http://ajcn.nutrition.org/content/74/2/1...f_ipsecsha

Your original claim was that, "You can find every thing that you find in meat in fruits, nuts, beans, vegies, root foods without all the crap that you find in meat." However, even you acknowledge that this is not true, that you need to supplement it with bacteria and other incidentals from the environment. Supplementing is supplementing, whether it comes from a pill or from dirty water. Moreover your assertion is only consistent with those who can supplement their diet with these intestinal flora. For the greater part of the world, either the environment doesn't provide such, or the food delivery system upon which the people depend cannot provide it. So, no, they cannot "find every thing that you find in meat in fruits, nuts, beans, vegies, root foods." Your original claim was both false, and your expanded claim represents a pie in the sky impracticality which is only available to a select few. So, no, you are simply wrong.