Jews don't eat it because it was forbidden to them in the Old Testament. Muslims don't eat it because it is forbidden in the Koran. Muslims are allowed to eat any animal that is slaughtered by the Jewish KOSHER method as well. Why do Christians eat pork when they acknowledge the Old Testament as being an authentic book of God? Does the New Testament give permission? If so, why and who gave the permission? I don't understand.

Would someone please explain this to me as I don't have knowledge in this respect. This is not a "fight" thread. Just to help me understand.
Thanking you all in advance