James Crossley has a useful post on his blog in which he addresses Jewish-Gentile table fellowship. The perceived notion conveyed by many is that circumcision was the issue preventing Jews and pagans eating together; and this clouds their reading of the letters of Paul.
James examines the literature of the first centuries and shows that circumcision was not the issue, but rather the purity of the foods. The food had to be both acceptable under the Jewish food laws and prepared by appropriate methods as established in the Law.