They were not. Had they been Messianic Jews, they would have kept Jewish dietary practices, and we know from Scripture that they didn't.
How silly of me. They celebrated the Resurrection with a BBQ Pork Roast. It's gotta be somewhere in the Bible. We'll die without pork, right? The streets of Heaven will be lined with bacon.
Dietary indulgence against Gods wishes resulted in eviction from the Garden of Eden and the death of mankind. You'll quote some cryptic verse about meat sacrificed to idols or something about "all meats" while the audience at that time knew very well about clean and unclean and knew it did not include unclean. But go ahead, enlighten me.