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

[The Grand Nudger]

There are pressures on evolutionary biology that make it difficult for us to express this trait - but no reason as to why a divine engineer couldn't write it in, when he did for them and even for other animals.  

The links you present seem to focus entirely on photosynthetic autotrophism, not the only kind..but fair enough...however, from your own links... 
(3 shitty quora...what the actual fuck man..up your game, lol)

All the quora links circle the drain with the same objection "super difficult, messes with evolution, etc etc etc)

Theoretically, it's definitely within the realm of the possible. But it would be screwing with millions of years of evolution, and would more than likely result in a lot of messed up humans.

Not a problem for the "creator".  It's becoming less and less of a problem for the jumped up chimps.

-from the second

But it’s not all doom and gloom. Although 7% doesn’t sound like much it all adds up. Just think 13,800,000 km2 of the earth’s surface is taken up by crops and farmland, 7% of this is nearly 1 million square kilometres, an area about the size of Egypt! This land could be put to use as housing to ease the worlds crippling over population and lack of space, or even as extra public parks and spaces.

But what if we kept this land as farm land? What if we used it to a better purpose? 1,000,000 km 2 of farm land equates to a lot of food. If we take the example of wheat, the world’s staple food and one of the most important grains in production. In the year of 2010 the world wheat production was 651 megatons. If 7% of this was going spare, 45.5 megatons, we would have enough grain to feed nearly half a billion people (assuming average consumption of 100kg per annum).  But then again, there are around 1 billion malnourished people in the world, so would this 45.5 megatons of wheat stretch that far? Let’s look at the human body’s most essential micronutrient, iron. Iron is needed to allow the oxygen we breathe in to bond to the haemoglobin in our blood, without which, we simply wouldn’t be able to live. Iron deficiency is defined as having less than 55% of our recommended daily intake of iron. So if we assume that less than 55% of any food stuff equates to malnourishment, or a food deficiency, our ½ billion people worth’s of food could feed every malnourished child, adult and homeless person in the world (within the realms of statistical error).

No matter how you slice it...and even if you stay within the confines of current evolutionary biology......for reasons?......it's inescapable.  The design was flawed, so we had to come up with a method of food production.  This didn't completely surmount our own design flaws (or the flaws of livestock..why -do- they feel pain..again, from a creators point of view?), so we improved our model of food production to be more ethical and..well, productive.  Even this is not completely sufficient, but if we had just a modicum of the abilities granted to other "created organisms"..it would be that much improved yet again.

One can only surmise that the proposed creator is an idiot....or he just enjoys the show. Can a better world be engineered, within the realm of possibility and in this world? OFC it can..we've been doing it for at least 10k years.

As a fun bit of speculative biology, there's no discernable reason -other- than predation that the autotrophs didn't develop into the dominant sentient life forms on the planet, they're already dominant..but their broad immotility means that organs like brains, or at least like our brains..would be a deleterious adaptation. Yet another "oopsie" moment for the author of life. Nevertheless, even -they- improved upon their design to the point that many plants are capable of expressing behaviors commonly associated with "more complex" animals - granting them immense advantage over their counterparts. God just can't get anything right, apparently.