Okay........lemmie break down the 10 Commandments and why they say what they do.....
1. Thou shalt not have any gods before Me. Why? If you place your faith in a graven image over placing your faith in God, the false gods can't do anything for you, because they're not real.
2. Thou shalt not make graven images. Why? See Commandment 1. If you make an image of God, you'll start worshiping it rather than the real God. Matter of fact, Judges has something to say along the lines of that when they turned the Ark of the Covenant into just a relic to be used in time of war, and in doing so, they forgot who God was, and He left them, and because they weren't protected, they were killed.
3. Thou shalt not take the name of the Lord thy God in vain. Why? Simple.......He's the Creator and deserves a certain amount of respect. I mean, would you bad mouth the CEO of your company that you work for?
4. Remember the Sabbath Day and keep it holy. Why? You should take at least 1 day to check in with God and remember Him.
5. Honor thy father and mother. They brought you into this world, they can take you out of it. Besides...........SHOULDN'T you honor the people that gave you a start?
6. Thou shalt not murder (yeah......I know most Bibles say "kill", but the real translation from the original Hebrew is murder). Why? If you kill someone, their family is gonna want to murder you.
7. Thou shalt not commit adultery. If you get caught messing around with someone's wife or husband, they're gonna want to murder you.
8. Thou shalt not steal. If you steal something valuable enough, the person you stole it from is gonna want to murder you.
9. Thou shalt not bear false witness. If you lie badly enough, someone is gonna want to murder you.
10. Thou shalt not covet thy neighbor's things. If you get jealous enough of what your neighbor has, you may end up going over and either stealing or killing them to get it.
Basically........the 10 Commandments are there so that the human race can survive and build a decent community. Same thing with the 613 Mitzvoht in the Judaic religion. Not everyone is a priest, or a butcher, or a wife, or a husband, so you don't have to follow all of them, just the ones that apply to you and your place in the community.
And, if a person was to look at the dietary restrictions that were originally given to the Jews, you'd see that certain foods were forbidden because many of them carried diseases and parasites that couldn't be taken care of back in Biblical times. Matter of fact, pigs were known to be unclean animals, and pork was not really safe to eat until modern times as pigs are known to carry trichinosis.
Even today, if you eat shellfish, you know that the only months that you can eat them safely are months that have "r" in them.
But...........like I've said before..........the only real sins are the ones that go against the 10 Commandments or the 7 Noahide Commandments.
And, the verse from Leviticus that everyone likes to quote is actually a book of rules for those in the priesthood of the Judaic theology. You can't have priests doing each other, because then they can't effectively spiritually guide the people.