Yeah, because the Roman govt had ousted the Jews from Rome--and this included Jewish believers--and, returning to Rome, they were finding Gentiles filling their church, so there was an issue that they kept more Law-based practices, as it was their conviction, but Gentiles did not. Peter is used as an example. We are called to freedom to walk in the convictions in our minds--"the law of my mind" (Ro 7).I didnt mention peter, what is being referred to in the passage you quoted is simply clean/unclean foods