Funny enough initially in the Bible people weren’t supposed to eat meat at all, then they loosened the restrictions but had rules for certain species (although I don’t recall if animal sacrifices started before or after this). Then in the new testament they did away with a bunch of rules but in a very vague way so Christians get to cherry pick what they want and when then argue about it with other Christians. Although there was also a story about a blanket or something with a ton of “bad” meat where god said to eat so I guess that counts as justification