Featured Catholic tradition, not the Bible, teaches a change to Sundaykeeping.

Read your Bible and see which day the Bible say is the Lords day.

 

Need to look a little more to see what its based on...

The retention of the old pagan name, 'Dies Solis' [day of the Sun] or 'Sunday' for the weekly Christian festival, is, in great measure, owing to the union of pagan and Christian sentiment, with which the first day of the week was recommended by Constantine to his subjects, Pagan and Christian alike, as the venerable day of the sun' . . . It was his mode of harmonizing the discordant religions of the empire under one common institution." --Dean Stanley [Episcopalian leader], Lectures on the Eastern Church, Lecture 6, p. 184.

"Constantine labored at this time untiringly to unite the worshipers of the old [pagan] and the new [Christian] faith in one religion. All his laws and contrivances are aimed at promoting this amalgamation [combining] of religions. He would by all lawful and peaceable means melt together a purified heathen ism and a moderated [compromising] Christianity . . . Of all his blending and melting together of Christianity and heathenism none is more easy to see through than this making of his Sunday law. The Christians worshiped their Christ, the heathen their sun-god; according to the opinion of the Emperor, the objects for worship in both religions being the same [the worship of a divine person on a select day of the week]."--H. G. Heggtveit, Illustreret Kirkehistorie, 1895, p. 202. [Hallvard Heggtveit (1850-1924) was a Norwegian church historian and teacher].


It was the Roman Imperial plan on several occasions, to unite all religions of the Empire into one religion--sun-worship: "The Jewish, the Samaritan, even the Christian, were to be fused and recast into one great system, of which the sun was to be the central object of adoration."--Henry Hart Milman, The History of Christianity, bk. 2, chap. 8 (Vol. II, p. 175). [Dr. Milman (1791-1868) was an important historian of England and dean of St. Paul's Cathedral in London].


When Christianity conquered Rome the ecclesiastical structure of the pagan church, the title and vestments of the pontifex maximus, the worship of the Great Mother and a multitude of comforting divinities, the sense of supersensible presences everywhere, the joy or solemnity of old festivals, and the pageantry of immemorial ceremony, passed like maternal blood into the new religion, and captive Rome captured her conqueror. The reins and skill of government were handed down by a dying empire to a virile papacy; the lost power of the broken sword was rewon by the magic of the consoling word; the armies of the state were replaced by the missionaries of the Church moving in all directions along the Roman roads; and the revolted provinces, accepting Christianity, again acknowledged the sovereignty of Rome. Through the long struggles of the Age of Faith the authority of the ancient capital persisted and grew, until in the Renaissance the classic culture seemed to rise from the grave, and the immortal city became once more the center of summit of the world's life and wealth and art. When, in 1936, Rome celebrated the 2689th anniversary of her foundation, she could look back upon the most impressive continuity of government and civilization in the history of mankind. May she rise again.(CAESAR AND CHRIST, A history of Roman Civilization and of Christianity from their beginnings to A.D.325. By Will Durant-1944)