Is it LAWFUL to kill animals?

Although if it is what I suspect, it's the udder gender.

So all the precise instructions to the Levites on how to slaughter
animals and treat animal sacrifices were made up by men? Hmmm

And to the people in general regarding animal sacrifices?

It is considered law. Luke 2:24
And to offer a sacrifice according to what is said in the Law
of the Lord, “a pair of turtledoves, or two young pigeons.”

Perhaps you need to give Leviticus a good read

And God's preference of Abel's animal sacrifice over Cain's grain offering?

Lotta lotta juggling you have to do. Starting right in Genesis

i can do no good, only God is Good, all glory to God.
Mat 19:17 And he said unto him, Why callest thou me good? there is none good but one, that is, God:
All Good comes from God.

That is what is called 'attention to detail'.

You can eat what ever you want to. It is your choice.
My point is that at the height of our health and wellness, we were vegetarian. God gave us a vegetarian diet because that was best for us physically and mentally. God knows what is best for us.

Completely irrelevant misapplication of Scripture. Here's the verse we were discussing:

If anyone, then, knows the good they ought to do and doesn’t do it, it is sin for them. (NIV)

If we take your verses at face value, James 4:17 is contradictory because it is impossible for us to do the good that we "ought" to do. I can assure you, Scripture doesn't contradict itself.

Agreed. You could have stopped right there.

Your argument is fallacious. The vegetarian diet was best in that environment. We don't live in that environment, so the best diet for there and then is not necessarily the "best" diet for here and now.

let me try to explain it again

We know what is good because God reveals it, we understand good because God is good and puts the Good in us. And we are empowered to do good by God, God gives us the ability to do good. So without God i can do no good. With God i can do good.
All Good comes from God....
When i know to do good (If anyone, then, knows the good they ought to do) which comes from God, and i don't do it, it is sin (and doesn’t do it, it is sin for them.) because I'm ignoring God and closing my heart to the prompting of the Holy Spirit.

The reason i applied this verse is because each situation is different. If it is good to let an animal live and God tells me to not kill an animal i should listen to God and not sin. But if it is good to kill an animal then i should listen to God and kill it.

Totally agree
Best diet for a sinful, stupid, selfish, deprived, Godless human race is one that kills us quicker.

Only when we are given greatly reduced lifespans.

Good; I agree with you.

Wow. Do you feel better now?

What about the tests written in the Word, do they prove?

Daniel 1:5 And the king appointed for them a daily provision of the king’s delicacies and of the wine which he drank, and three years of training for them, so that at the end of that time they might serve before the king

8 But Daniel purposed in his heart that he would not defile himself with the portion of the king’s delicacies, nor with the wine which he drank; therefore he requested of the chief of the eunuchs that he might not defile himself.

11 So Daniel said to the steward whom the chief of the eunuchs had set over Daniel, Hananiah, Mishael, and Azariah,
12 “Please test your servants for ten days, and let them give us vegetables to eat and water to drink.
13 Then let our appearance be examined before you, and the appearance of the young men who eat the portion of the king’s delicacies; and as you see fit, so deal with your servants.”
14 So he consented with them in this matter, and tested them ten days.

15 And at the end of ten days their features appeared better and fatter in flesh than all the young men who ate the portion of the king’s delicacies.
16 Thus the steward took away their portion of delicacies and the wine that they were to drink, and gave them vegetables.

17 As for these four young men, God gave them knowledge and skill in all literature and wisdom; and Daniel had understanding in all visions and dreams.

-The results of the test are positive: "better and fatter" within ten days.
You are full talk and no walk, if you say you have compassion with your tongue, but your hand doth kill them.

Matthew 15:8 This people draweth nigh unto me with their mouth, and honoureth me with their lips; but their heart is far from me.

You need to put your money where your mouth is.
Are the Septuagint, the Latin Vulgate and the KJV 1611 Scripture?
This is one of those things everyone has to decide for themselves, either you believe God delights in the innocent blood of murdered animals, or not. I can only present the verses:

Jeremiah 7:22 For I spake not unto your fathers, nor commanded them in the day that I brought them out of the land of Egypt, concerning burnt offerings or sacrifices:

Ezekiel 5:6 And she hath changed my judgments into wickedness more than the nations, and my statutes more than the countries that are round about her: for they have refused my judgments and my statutes, they have not walked in them.

Malachi 2:8 But ye are departed out of the way; ye have caused many to stumble at the law; ye have corrupted the covenant of Levi, saith the LORD of hosts.

Matthew 13:27 So the servants of the householder came and said unto him, Sir, didst not thou sow good seed in thy field? from whence then hath it tares?
28 He said unto them, An enemy hath done this. The servants said unto him, Wilt thou then that we go and gather them up?
29 But he said, Nay; lest while ye gather up the tares, ye root up also the wheat with them.

Isaiah 1:11 To what purpose is the multitude of your sacrifices unto me? saith the Lord: I am full of the burnt offerings of rams, and the fat of fed beasts; and I delight not in the blood of bullocks, or of lambs, or of he goats.

Psalms 51:16 For thou desirest not sacrifice; else would I give it: thou delightest not in burnt offering.
17 The sacrifices of God are a broken spirit: a broken and a contrite heart, O God, thou wilt not despise.

1 Samuel 15:22 And Samuel said, Hath the Lord as great delight in burnt offerings and sacrifices, as in obeying the voice of the Lord? Behold, to obey is better than sacrifice, and to hearken than the fat of rams.

Ecclesiastes 5:1 Keep thy foot when thou goest to the house of God, and be more ready to hear, than to give the sacrifice of fools: for they consider not that they do evil.

Proverbs 6:16 These six things doth the Lord hate: yea, seven are an abomination unto him:
17 A proud look, a lying tongue, and hands that shed innocent blood,

Hosea 6:6 For I desired mercy, and not sacrifice; and the knowledge of God more than burnt offerings.

Isaiah 66:3 He that killeth an ox is as if he slew a man; he that sacrificeth a lamb, as if he cut off a dog's neck; he that offereth an oblation, as if he offered swine's blood; he that burneth incense, as if he blessed an idol. Yea, they have chosen their own ways, and their soul delighteth in their abominations.

Matthew 12:7 But if ye had known what this meaneth, I will have mercy, and not sacrifice, ye would not have condemned the guiltless.
Murder was unlawful since the beginning:

John 8:44 Ye are of your father the devil, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father of it.

1 John 3:12 Not as Cain, who was of that wicked one, and slew his brother. And wherefore slew he him? Because his own works were evil, and his brother's righteous.

-The Law cannot change, murder will never be allowed:

Hebrews 13:8 Jesus Christ the same yesterday, and to day, and for ever.

Malachi 3:6 For I am the Lord, I change not; therefore ye sons of Jacob are not consumed.

Baruch 4:1 This is the book of the commandments of God, and the law that endureth for ever: all they that keep it shall come to life; but such as leave it shall die.
No, that is why He gave the herbs and fruits to Adam, who lived almost a 1000 years:

Genesis 1:29 And God said, “See, I have given you every herb that yields seed which is on the face of all the earth, and every tree whose fruit yields seed; to you it shall be for food.

Do what you think is best for your health.
Killing animals is not a sin....
Eating meat is not a sin.....
I just know that Adam and Eve were created in Gods image and were vegetarians, The DNA has not changed (it has deteriorated), and because of sin meat was added to the diet.
My personal research points me to a plant based diet, (and many other things) for best health.
1Co 3:16 Know ye not that ye are the temple of God, and that the Spirit of God dwelleth in you?
1Co 3:17 If any man defile the temple of God, him shall God destroy; for the temple of God is holy, which temple ye are.

Where does the text say that meat was added due to sin?

If DNA has not changed, how could it deteriorate?

Those seem like contradictory statements.

It was healthier for us to live shorter lives. Living long lives in sin = the world before the flood. It was better for us to eat meat then to stave and God gave conditions.
If i had nothing to eat except meat to survive i would.

If nothing died before the fall..... Meat was not introduced until Gen 9.... meat will not be eaten in sinless Heaven.... logic all adds up to the fact that meat in our diet is a result of sin. No sin in our world would = no meat in our diet.