As far as eating pork or shellfish goes, in today's reading from Acts 10:1-16, Peter is commanded three times to "kill and eat" all manner of things.
About noon the next day, as they were on their journey and approaching the city, Peter went up on the roof to pray. He became hungry and wanted something to eat; and while it was being prepared, he fell into a trance. He saw the heaven opened and something like a large sheet coming down, being lowered to the ground by its four corners. In it were all kinds of four-footed creatures and reptiles and birds of the air. Then he heard a voice saying, ‘Get up, Peter; kill and eat.’ But Peter said, ‘By no means, Lord; for I have never eaten anything that is profane or unclean.’ The voice said to him again, a second time, ‘What God has made clean, you must not call profane.’ This happened three times, and the thing was suddenly taken up to heaven.If we did not have Peter's vision, how would Christians today feel about the liberty to indulge in pork products? Would there be a group of "orthodox" Christians who eat pulled turkey on the Fourth of July and another group of "liberal" Christians who eat barbequed pork and shrimp?
Would the "liberal" pork eaters ask the "orthodox" to bless their meal?
Would the pork eaters pass a resolution at a General Convention of the church to provide for liturgies for the blessing of their dinner?