Right? I think it’s a christian thing. There’s gotta be something about eating fish being okay in their bible because the amount of times I heard “fish aren’t meat”
Christians are allowed to eat all food. Only Christ is what saves. (Mark 7:19)
But the fish / meat / etc is a tradition thing, so it comes from the culture surrounding the Christian, and probably more relating to Jewish history more than anything
I was told by my teacher as a kid that traditional Catholics used to believe that if you didn't eat fish on Fridays, you'd go to Hell. I wonder if that was true?
You don't have to eat fish, you just have to avoid poultry and red meat. The intent was sacrifice as penance for sins. And in the US and some other countries, it's really only mentioned during Lent (Ash Wednesday to the day before Easter); the rest of the year, it's encouraged to do that or some other form of penance, but everyone ignores it.