AlyssaJulianna said in post 1:
Do Christians need to keep Kosher food laws?
Under the New Covenant, all foods are in themselves okay for all believers, whether Jews or Gentiles, to eat (1 Timothy 4:4-5, Romans 14:14,20, Mark 7:18-19; 1 Corinthians 10:25-30, Colossians 2:16-17, Hebrews 9:10). For under the New Covenant, no meat is defiled in itself (Romans 14:14), all meats are pure (Romans 14:20). Every meat is good, and no meat is to be refused if it's received with thanksgiving to God, for it's sanctified by the Word of God and prayer (1 Timothy 4:4-5). Let no one therefore judge you regarding what meat you eat (Colossians 2:16-17, Hebrews 9:10). For the kingdom of God doesn't consist of what meat we eat or don't eat, but consists of righteousness, peace, and joy in the Holy Spirit (Romans 14:17). Happy are those believers, both Jews and Gentiles, who don't condemn themselves over what meat they eat (Romans 14:22), for no meat can defile them (Mark 7:18-19).
It's sometimes claimed that we shouldn't eat animals that were "unclean" under the letter of the Old Covenant Mosaic law (Leviticus 11) because they're detrimental to health. But where does it say that they were "unclean" because they're detrimental to health? Even pork isn't detrimental to health when it's cooked properly. That's why there are so many healthy old people in China, a nation which thrives on properly-cooked pork. So the dietary restrictions of the letter of the Old Covenant Mosaic law weren't for health purposes, but must have been symbolic, just as Acts 10:11-15 wasn't for health purposes, but was symbolic (Acts 10:28), and just as the clothing restrictions and hair-cutting restrictions of the letter of the Old Covenant Mosaic law weren't for health purposes, but must have been symbolic. For people can live long and healthy lives wearing clothing made of mixed fibers (such as cotton/nylon blends), even though this goes against the letter of Deuteronomy 22:11. And people can live long and healthy lives shaving the sides of their heads and beards, even though this goes against the letter of Leviticus 19:27.
The idea of "clean" and "unclean" in the Old Testament wasn't derived from whether or not something was to be eaten, for people and inedible objects could also be "clean" or "unclean" (Leviticus 11:24-40). Instead, it was derived from whether or not something (whether human, animal, or object) was considered by God in Old Testament times to be holy/not guilty or unholy/guilty (Leviticus 11:43-47, Leviticus 5:2b-3, Leviticus 10:10).
On Jesus' Cross, for both Jews and Gentiles (John 11:51-52), of all times, the letter of the Old Covenant Mosaic law was abolished (Ephesians 2:15-16, Colossians 2:14-17; 2 Corinthians 3:6-18), disannulled (Hebrews 7:18), rendered obsolete (Hebrews 8:13, Galatians 3:2-25, Galatians 4:21 to 5:8), taken away and replaced (Hebrews 10:9) by the better hope (Hebrews 7:19), the better covenant (Hebrews 7:22, Hebrews 8:6-12), the 2nd covenant (Hebrews 8:7, Hebrews 10:9), of Jesus' New Covenant law (Galatians 6:2, John 1:17, Matthew 26:28, Hebrews 12:24, Hebrews 9:15), so that the law was changed (Hebrews 7:12).
All believers, both Jews and Gentles, of all times, are delivered from the letter of the Old Covenant Mosaic law and shouldn't keep it (Romans 7:6; 2 Corinthians 3:6-18, Galatians 2:11-21) or have any desire to keep it (Galatians 4:21 to 5:8, Galatians 3:2-25). Believers keep the spirit of the Old Covenant Mosaic law (Romans 7:6) by loving others (Galatians 5:14, Romans 13:8-10), by doing to others as they would have others do to them (Matthew 7:12).
The New Covenant is a new law (Hebrews 7:12,18,19, Hebrews 10:1-23), consisting of Jesus' New Covenant/New Testament commandments (John 14:15), such as those he gave in the Sermon on the Mount (Matthew 5:19 to 7:29) and in the epistles of Paul the apostle (1 Corinthians 14:37). These commandments exceed in righteousness the abolished letter of the Old Covenant Mosaic law (Matthew 5:20-48). So there's no reason why any believer should ever want to go back under the letter of the Old Covenant Mosaic law (Galatians 3:2 to 5:26). It was just a temporary schoolmaster (Galatians 3:24-25), a temporary shadow (Colossians 2:16-17), which God set up because of sins long after he had set up the original promise of the Abrahamic Covenant, and long before he brought that promise to fulfillment in Jesus' New Covenant (Galatians 3:16-29, Matthew 26:28).
The letter of the Old Covenant Mosaic law has been made obsolete by the New Covenant (Hebrews 8:13). For example, the letter of the Old Covenant Mosaic law required an Aaronic priesthood (Exodus 30:30), whereas the New Covenant replaced the Aaronic priesthood with the Melchisedechian priesthood (Hebrews 7:11-28). Also, the letter of the Old Covenant Mosaic law required animal sacrifices (e.g. Leviticus 23:19), whereas the New Covenant replaced those with the one-time sacrifice of Jesus (Hebrews 10).
The letter of the Old Covenant Mosaic law is the Hagar to the New Covenant's Sarah (Galatians 4:22-25), so that those people, whether Jews or Gentiles, who try to keep the letter of the Old Covenant Mosaic law are like Ishmael, whereas those people, whether Jews or Gentiles, who keep the New Covenant are like Isaac (Galatians 4:22-31).
The letter of the Old Covenant Mosaic law (including the letter of the 10 commandments), written and engraven in stones (2 Corinthians 3:7, Deuteronomy 4:13, Deuteronomy 27:8), was the ministration of death and condemnation (2 Corinthians 3:7,9). For example, see Leviticus 20:10, Exodus 31:14, and Numbers 15:32-36; and contrast these with the New Covenant's John 8:4-11 and Matthew 12:1-8. The letter of the Old Covenant Mosaic law has been done away (2 Corinthians 3:11), abolished (2 Corinthians 3:13b). But it's still able to spiritually blind some people as with a veil from beholding Jesus (2 Corinthians 3:14-16), whereas the New Covenant is the ministration of the spirit and righteousness (2 Corinthians 3:6,8,9b), which remains (2 Corinthians 3:11b), and which permits believers to remove the veil and to behold Jesus (2 Corinthians 3:16-18, Mark 15:38, Hebrews 7:18-19, Ephesians 2:15-18, Colossians 2:14-17).
But a mistaken spirit of Pharisaism can still sometimes deceive even Christians into thinking that they must keep the letter of the Old Covenant Mosaic law in order to be saved (Acts 15:1,5), or in order to become perfect (Galatians 3:2 to 5:26). This is a false, cursed gospel (Galatians 1:6-9). For if any believers are keeping any part of the letter of the Old Covenant Mosaic law, thinking that they must do so in order to be saved, or in order to become perfect, then Jesus will profit them nothing; they have fallen from grace (Galatians 5:2-8).
We are God's creation, He knows what kind of fuel is best. I know there have been studies which you can research. I am sure the book talks about those. If you think about the things you don't eat on a kosher diet, it's all the bottom-feeders. Pigs will eat anything. Pigs will eat other pigs if given the chance. Same with chickens, that's why it's better to get vegetarian-fed chickens. Shrimp are literally bottom-feeders, eating every nasty thing that sinks to the bottom of the oceans. Vultures are scavengers eating dead, rotting carcasses. What those animals eat affects them, what we eat affects us. 
