Here are quite a few quotes and writings from the Catholic church about the Sabbath being changed to Sunday. Notice how they don't try to argue that Sunday worship was biblical. Matter of fact, they say the opposite. The Catholic church takes credit for changing it due to divine authority. So don't take my word for it.
Cardinal Gibbons, in Faith of Our Fathers, 92nd ed., p. 89, freely admits, “You may read the Bible from Genesis to Revelation, and you will not find a single line authorizing the sanctification of Sunday. The Scriptures enforce the religious observance of Saturday, a day which we [the Catholic Church] never sanctify.”
Again, “The Catholic Church, … by virtue of her divine mission, changed the day from Saturday to Sunday” (The Catholic Mirror, official publication of James Cardinal Gibbons, Sept. 23, 1893).
“Protestants do not realize that by observing Sunday, they accept the authority of the spokesperson of the Church, the Pope” (Our Sunday Visitor, February 5, 1950).
“Of course the Catholic Church claims that the change [Saturday Sabbath to Sunday] was her act... And the act is a mark of her ecclesiastical authority in religious things” (H.F. Thomas, Chancellor of Cardinal Gibbons).
The Catholic Church claims that “the church is above the Bible, and this transference of Sabbath observance is proof of that fact” (Catholic Record of London, Ontario Sept 1, 1923).
“Prove to me from the Bible alone that I am bound to keep Sunday holy. There is no such law in the Bible. It is a law of the Catholic Church alone. The Catholic Church says, by my divine power I abolish the Sabbath day and command you to keep holy the first day of the week. And lo! The entire civilized world bows down in reverent obedience to the command of the Holy Catholic Church” (Thomas Enright, CSSR, President, Redemptorist College [Roman Catholic], Kansas City, MO, Feb. 18, 1884).
“The Pope has power to change times, to abrogate laws, and to dispense with all things, even the precepts of Christ. The Pope has authority and has often exercised it, to dispense with the command of Christ” (Decretal, de Tranlatic Episcop).
“The sun was a foremost god with heathendom… There is, in truth, something royal, kingly about the sun, making it a fit emblem of Jesus, the Sun of Justice. Hence the church in these countries would seem to have said, ‘Keep that old pagan name. It shall remain consecrated, sanctified’” The Catholic World, March 1994, p. 809
"Canon 29- Christians shall not Judaize and be idle on Saturday. But shall work on that day; but the Lord's day they shall especially honor. And, as being Christians, shall, if possible, do no work on that day." Hefele's Councils, Vol.2, b. 6. Council Laodicia 365AD
“It was the holy Catholic Church that changed the day of rest from Saturday to Sunday, the 1st day of the week. And it not only compelled all to keep Sunday, but at the Council of Laodicea, AD 364, anathematized those who kept the Sabbath and urged all persons to labor on the 7th day under penalty of anathema.” Catholic Priest T. Enright, CSSR, Kansas City, MO
“Protestantism, in discarding the authority of the church, has no good reason for its Sunday theory, and ought, logically, to keep Saturday with the Jews.” American Catholic Quarterly Review, Jan 1883
“How do you prove that the church has power to institute festivals?” ”Had she not such power, she could not have done that in which all modern religionist agree with her; -she could have substituted the observance of Sunday the first day of the week, for the observance of Saturday the seventh day, a change for which there is no Scriptural authority.” A Doctrinal Catechism, Steve Kennan, p. 174
“The Bible says remember that thou keep holy the Sabbath day. The Catholic church says No! By my divine power I abolish the Sabbath day and command you to keep holy the first day of the week. And lo the entire civilized world bows down in reverent obedience to the command of the holy Catholic church.” American Sentinel, Father Enright, June 1893
“Perhaps the boldest thing, the most revolutionary change the Church ever did happened in the first century. The holy day, the Sabbath, was changed from Saturday to Sunday… not from any directions noted in the Scriptures, but from the Church’s sense of its own power… People who think that the Scriptures should be the sole authority, should logically become 7th Day Adventists, and keep the Saturday holy.” Saint Catherine Catholic Church Sentinel, May 21, 1995
“The authority of the Church could, therefore, not be bound to the authority of the Scriptures, because the Church had changed… the Sabbath into Sunday, not by the command of Christ, but by its own authority.” Canon on Tradition, p. 263
“Sunday is our mark of authority… The church s above the Bible, and this transference of Sabbath observance is proof of that fact.” Catholic Record, Sept 1, 1923
“Nowhere in the Bible do we find that Christ or the Apostles ordered that the Sabbath be changed from Saturday to Sunday. We have the commandment of God given to Moses to keep holy the Sabbath day, that is the 7th day of the week, Saturday. Today most Christians keep Sunday because it has been revealed to us by the [Roman Catholic] church outside the Bible” To Tell You the Truth, The Catholic Virginian, Oct. 3, 1947, p. 9
"Sunday – fulfillment of the Sabbath. Sunday is expressly distinguished from the Sabbath which it follows chronologically every week; for Christians its ceremonial observance replaces that of the Sabbath… The Sabbath, which represented the completion of the first creation, has been replaced by Sunday which recalls the new creation, has been replaced by Sunday which recalls the new creation inaugurated by the Resurrection of Christ… In respecting religious liberty and the common good of all, Christians should seek recognition of Sundays and the Church’s holy days as legal holidays.” The Catechism of the Catholic Church Section 2 Article 3 (1994)
“The (Catholic) Church changed the observance of the Sabbath to Sunday by right of the divine, infallible authority given to her by her Founder, Jesus Christ. The Protestant claiming the Bible to be the only guide of faith, has no warrant for observing Sunday. In this matter, the Seventh-day Adventist is the only consistent Protestant.” The Catholic Universe Bulletin, August 14, 1942
“But since Saturday, not Sunday, is specified in the Bible, isn’t it curious that non-Catholics who profess to take their religion directly from the Bible and not from the Church, observe Sunday instead of Saturday? Yes, of course, it is inconsistency but this change was made about fifteen centuries before Protestantism was born, and by that time the custom was universally observed. They have continued the custom even though it rests upon the authority of the Catholic Church and not upon an explicit text from the Bible. That observance remains as a reminder of the Mother Church from which the non-Catholic sects broke away like a boy running away from home but still carrying in his pocket a picture of his mother or a lock of her hair.” Dr. John O’Brien, Faith of Millions, pp. 543-544
“Reason and common sense demand the acceptance of One or the other of these alternatives: either Protestantism and the keeping holy of Saturday, or Catholicity and the keeping holy of Sunday. Compromise is impossible.” The Catholic Mirror, December 23, 1893
“She took the pagan Sunday and made it the Christian Sunday… and thus the pagan Sunday, dedicated to Balder, became the Christian Sunday sacred to Jesus.” Catholic World, March 1894, p. 809
“Of course the Catholic church claims that the change was her act, and the act is a mark of her ecclesiastical power.” Faith of our Fathers, Cardinal Gibbons
“Sunday is a Catholic institution, and its claims to observance can be defended only on Catholic principles… From the beginning to the end of Scripture there is not a single passage which warrants the transfer of weekly public worship from the last day of the week to the first.” Catholic Press (Sydney) August 25, 1900
“If Protestants would follow the Bible, they should worship God on the Sabbath Day. In keeping the Sunday they are following a law of the Catholic Church.” Albert Smith, Chancellor of the Archdiocese of Baltimore, replying for the Cardinal in a letter dated February 10, 1920