Q. Who gave the Catholic Church and the other Churches the authority to change the Lord’s Day from Saturday to Sunday?
A. The change of keeping the Lord’s Day on Sunday instead of Saturday was by the authority Jesus gave to Peter and the Church He founded. By giving the keys of the kingdom to Peter and the Church and the power to bind and loose (a rabbinic formula meaning “authority to Rule) the day of worship was changed to Sunday in celebration of the resurrection of Jesus. Interestingly, Jesus did nothing on Saturday or the Jewish Sabbath. But Friday was consecrated by His death and Sunday by His resurrection. Also, most if not all of His appearances to His apostles and others occured on SUNDAY.
So, of course those who do not accept the authority of the Catholic Church to rule would reject this change based on scripture alone. And others who also reject the Catholic Church and yet accept the sabbath change to Sunday accept this Catholic TRADITION and several others. Some of the other Catholic TRADITIONS Protestant accept are the canon of the New Testament, the Doctrine of the Trinity, and Incarnation. Because as I have said elsewhere, the New Testament and even the whole Bible is NOT a Systematic Theology text. Someone must interpret it. The question is: Who has authority to interpret it infallibly?