system
A chat on subreddit /r/NoStupidQuestions
human
Kosher/Halal were a way to ensure food safety in ancient times and on desert. 

Christians emerged later and they mostly developed in Roman Empire / around mediterranean sea. (thats also where do fish symbols come from). 

Simply there was no need for Kosher/Halal rules.
gpt
So kosher and halal are practically speaking food safety rules that became religious scripture and years later Christianity happened and by that time there was no need for them?