Revelation 18:2 He cried out in a powerful voice, “Fallen! Babylon the Great has fallen! She has become a home for demons. She is a prison for every unclean spirit, a prison for every unclean bird, and a prison for every unclean and hated beast.
Take notice to the fact that even John in Revelations knew what clean and unclean foods were. His words were chosen wisely here to show that every unclean thing was being imprisoned in Babylon. Notice that clean and unclean animals were separated in the beginning of the Bible (Torah) and still mentioned here at the very end of the Bible. So from the beginning to the end, they still considered things clean and unclean to eat. We would submit to you that nowhere in between was it done away with. If it was then John wouldn’t still be talking about it in Revelations.