Dear Protestant 101,
Saturday is a remembrance of creation. However, it was a shadow of what was to come (Col: 2:17).
Holy Scripture does not indicate whether it was Jesus Christ, who commanded his Church to change the obeservation of His day from the seventh to the first day of the week, or whether the Church did it. Regardless, Christ`s Church has the right to do it since Jesus commanded “Whatever you bind on earth shall be bound in heaven, and whatever you loose on earth shall be loosed in heaven.”
The Church did not abolish the content of Saturday. Rather, the sabbath, which represented the completion of the first creation, has been replaced by Sunday, which recalls the new creation inaugurated the Resurrection of Christ. (Catechism of the Catholic Church).
There were two Creations. “Therefore, if anyone is in Christ, he is a new creation; the old creation has passed away, behold the new creation has come.” (2 Cor 5:17)
For neither does circumcision mean anything, nor does uncircumcision, but only a new creation. " (Gal 6:15)
The Old Creation is commemorated by Saturday, the new one, by Sunday.
Moreover, the Church did not change Old Testament Saturday to Sunday in the year 313, as Adventists wrongly insist. It was help holy from the beginning. We can see that by reading the works of the early Church Fathers. I would be happy to cite examples of this if you like.
Nor, was the change done by force. For as we see in Romans "One man esteems one day better than another, while another man esteems all days alike. Let every one be fully convinced in his own mind. ** Anyone who observes the day, observes it in honor of the Lord. **Romans 14:5-6)
I hope this clarifies why Catholics, and most Christians, choose to worship the Lord on Sunday.
Sincerely,
Maria1212