I think you would find that the word circumcision could be used in place of sabbath (in terms of it being prior to the Law, codified by the Law, practiced by Jesus, etc.). And yet we know clearly that it is not required for Gentile believers. Granted, however, that the Sabbath is not so clearly exempted.It is MY OPINION that one of the reasons the church moved to Sunday vs. the Sabbath was because, in time, the divide between Jews and Christians became more and more intense. With the rise of Judaizers, it seemed that the early church grew more and more distrustful of Jews and/or those that thought Christians should observe certain Jewish traditions/requirements.The Catholic Church may have cemented the change, but it doesn't seem to me that it would have arisen organically from the notion that Jesus rose on that day. That is, it is hard for me to think that Christians said that they didn't have to observe the Sabbath just because Jesus was rose on the first day of the week. It seems that there must surely have been other drivers to the change. And it (again) my opinion that it all may have been a reaction to Judaism trying to control Christianity...or a reaction to feeling pushed out of synagogues by the increasingly bitter divide between Jews and Christians...or a reaction to being thought of as just another branch of Judaism (e.g., Pharisees, Saducees, and Christians).