It is not baseless. It is that a person amongst us, is simply ignorant of the sources/claims for it. I will let all decide who that person is after this response.
They say that they did.
See:
"... Now in the matter of Sabbath observance the Protestant rule of Faith is utterly unable to explain the substitution of the Christian Sunday for the Jewish Saturday.
It has been changed. The Bible still teaches that the Sabbath or Saturday should be kept holy. There is no authority in the New Testament for the substitution of Sunday for Saturday. Surely it is an important matter. It stands there in the Bible as one of the Ten Commandments of God. There is no authority in the Bible for abrogating this Commandment, or for transferring its observance to another day of the week.
For
Catholics it is not the slightest difficulty. "All power is given Me in heaven and on earth; as the Father sent Me so I also send you," said our Divine Lord in giving His tremendous commission to His Apostles. "He that heareth you heareth Me." We have in the authoritative voice of the Church the voice of Christ Himself.
The Church is above the Bible; and this transference of Sabbath observance from Saturday to Sunday is proof positive of that fact (1). Deny the authority of
the Church and you have no adequate or reasonable explanation or justification for the substitution of Sunday for Saturday ..."
(1.) The Catholic Record of London, Saturday, September 1st, 1923 edition, Ontario, Canada, Volume XLV, #2342, appearing on page 4, section "Sabbath Observance", Column 2, -- Editor -- Rev. James T. Foley, D.D. ... The CATHOLIC RECORD has been approved and recommended by Archbishops Falconio and Sbaretti, late Apostolic Delegates to Canada, the Archbishops of Toronto, Kingston, Ottawa, and St. Boniface, the Bishops of London, Hamilton, Peterborough and Ogdensburg, N.Y., and the Clergy throughout the Dominion.", Column 1 -
The Catholic Record, Sept. 1, 1923.
http://biblelight.net/Sources/Catholic-Record-6-shade.gif
Another:
Latin:
"... Similiter et feriae a fando dicuntur, ob quam causam
Silvester papa primus apud Romanos constituit ut dierum nomina quae antea secundum nomina deorum suorum vocabant, id est, Solis, Lunae, Martis, Mercurii, Veneris, Saturni, feria deinceps vocarent, id est, prima feria, secunda feria, tertia feria, quarta feria, quinta feria, sexta feria, quia in principio Genesis scriptum est quod Deus per singulos dies dixerit : prima, Fiat Lux; secunda, Fiat firmamentum; tertia, Producat terra herbam virentem, similiter, etc. Sabbatum autem antiquo legis vocabulo vocare praecepit, et primam feriam diem Dominicam, eo quod Dominus in illa resurrexit.
Statuit autem idem papa ut otium sabbati magis in diem Dominicam transferretur, ut ea die a terrenis operibus ad laudandum Deum vacaremus, justa illud quod scriptum est : Vacate et videte, quoniam ego sum Deus (Psal. XLV). ..."
- Beati Rabani Mauri, Fuldensis Abbatis et Moguntini Archiepiscopi, de Clericorum Institutione, ad Heistulphum Archiepiscopum; Libri Tres. (Anno 819.) Ad Fratres Fuldenses Epigramma Ejusdem; Liber Secundus, Caput XLVI. Column 361 (Left; PDF page 35) - http://www.documentacatholicaomnia....eistulphum_Archiepiscopum_Libri_Tres,_MLT.pdf
"... The decree by
Pope Sylvester I to call the days of the week feria was issued in
the year 316 A.D. according to Medii ævi Kalendarium Or, Dates, Charters, and Customs of the Middle Ages, Volume Two, by Robert Thomas Hampson, published in London by H. K. Causten, 1841, entry on Day, page 66, and Feria, pages 137, 138. ..." -
Exactly Which Pope Changed The Sabbath To Sunday?
"...
Pope Sylvester I (also Silvester, died 31 December 335), was Pope of the Catholic Church from
314 to his death in 335. ..." -
Pope Sylvester I - Wikipedia
Translated English (of the Latin above):
"...
Pope Sylvester first among the Romans ordered that the names of the days [of the week], which they previously called after the name of their gods, that is, [the day] of the Sun, [the day] of the Moon, [the day] of Mars, [the day] of Mercury, [the day] of Jupiter, [the day] of Venus, [the day] of Saturn, they should call
feriae thereafter, that is the first
feria, the second
feria, the third
feria, the fourth
feria, the fifth
feria, the sixth
feria, because that in the beginning of Genesis it is written that God said concerning each day: on the first, "Let there be light:; on the second, "Let there be a firmament"; on the third, "Let the earth bring forth verdure"; etc. But he [Sylvester] ordered [them] to call the Sabbath by the ancient term of the law, [to call] the first
feria the "Lord's day," because on it the Lord rose [from the dead],
Moreover, the same pope decreed that the rest of the Sabbath should be transferred rather to the Lord's day [Sunday], in order that on that day we should rest from worldly works for the praise of God.7 ..." -
Exactly Which Pope Changed The Sabbath To Sunday?
Further:
“...yet we find St. Cæsarius of Arles in the
sixth century teaching that the holy Doctors of the Church had decreed that the whole glory of the Jewish
Sabbath had been
transferred to the Sunday, and that Christians must keep the Sunday holy in the same way as the Jews had been commanded to keep holy the Sabbath Day. … From the
eight century the law began to be formulated as it exists at the present day, and the local councils forbade servile work, public buying and selling, pleading in the law courts, and the public and solemn taking of oaths. There is a large body of civil legislation on the Sunday rest side by side with the ecclesiastical. ...” [Roman Catholic Online Encyclopedia; Sunday] -
CATHOLIC ENCYCLOPEDIA: Sunday
“... Jesus exercised his sovereign power to abrogate the sabbath law in at least some way. …
The sabbath command is the only one
of the Ten Commandments which can be
altered in any way, because only it is a part of the ceremonial law. This is taught by the
Roman Catechism issued after the Council of Trent:
The other commandments of the Decalogue are precepts of the natural law, obligatory at all times and unalterable. Hence, after the abrogation of the Law of Moses, all the Commandments contained in the two tables are observed by Christians, not indeed because their observance is commanded by Moses, but because they are in conformity with nature which dictates obedience to them.
This Commandment about the observance of the sabbath, on the other hand, considered as to the time appointed for its fulfillment, is
not fixed and unalterable, but susceptible of change and belongs not to the moral, but the ceremonial law. Neither is it a principle of the natural law; we are not instructed by nature to give external worship to God on that day, rather than on any other. And in fact the sabbath was kept holy only from the time of Israel from the bondage of Pharaoh.
The observance of the sabbath was to be
abrogated at the same time as the other Hebrew rites and ceremonies, that is, at the death of Christ. . . .” [Roman Catholic Online Library; Quick Questions (1994)] -
CATHOLIC LIBRARY: Quick Questions (1994)
“... Today Jews and other groups who keep the sabbath, such as the Seventh-Day Adventists, continue to celebrate it from sundown Friday to sundown Saturday. This way of reckoning time was not the only one in the ancient world. For example, the Romans reckoned days from midnight to midnight--the system we use today. …
Sunday is often spoken of as "the Christian sabbath," but this is not a technical description. Sunday is not a strict replacement for the
sabbath (which has
been abolished), but
a day the Church instituted to fulfill a parallel function. ...” [Roman Catholic Online Library; Quick Questions (1994)] -
CATHOLIC LIBRARY: Quick Questions (1994)
“...With regard to the exposition of this commandment, the faithful are to be carefully taught in what it accords with, and in what it differs from the others, in order that they may understand why Christians observe not the Sabbath, but the Lord's day. … all the commandments contained in the two tables are observed by Christians … whereas
this commandment, if considered as to the time of its fulfillment,
is not fixed and unalterable, but is susceptible of change, and belongs not to the moral but ceremonial Law. … ” [The Catechism of the Council of Trent published by command of Pope Pius The Fifth, translated into English by the Rev. J. Donovon, Professor, &c Royal College, Maynooth; Baltimore: Published by Lucas Brothers. No. 170 Market Street; Printed By James Young, Baltimore; On The Third Commandment; pg 264] -
The catechism of the Council of Trent
“...But the Church of God
[Roman Catholic church] has
in her wisdom ordained that the celebration of the Sabbath should be
transferred to “the Lord's day:” …” [The Catechism of the Council of Trent; On The Third Commandment; pg 267] -
The catechism of the Council of Trent
The catechism of the Council of Trent : Catholic Church : Free Download, Borrow, and Streaming : Internet Archive
“...Now
the Scriptures alone do not contain all the truths which a Christian is bound to believe, nor do they explicitly enjoin all the duties which he is obliged to practice. Not to mention other examples, is not every Christian obliged to sanctify
Sunday and to abstain on that day from unnecessary servile work? Is not the observance of this law among the most prominent of our sacred duties? But
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 never sanctify. ...” [The Faith Of Our Fathers “Being a Plain Exposition and Vindication of the Church Founded by Our Lord Jesus Christ” By James Cardinal Gibbons; Archbishop of Baltimore, Ninety-third Carefully Revised and Enlarged Edition; John Murphy Company; Publishers; Baltimore, MD. New York; R. & T. Washbourne, Ltd.; 10 Paternoster Row, London, and at Manchester.; Birmingham and Glascow; 1917; Chapter VIII [8]. The Church And The Bible; Online Pg 97, also side notation pagination as [089]] -
http://www.gutenberg.org/files/27435/27435-pdf.pdf
That is only
one record, of a
specific 'catholic' (not Christian) 'synod' in the mid 300's (circa 363, the 4th Cent.).
"... The Laodicea at which the Synod met is Laodicea in Phrygia Pacatiana, also called Laodicea ad Lycum, and to be carefully distinguished from the Laodicea in Syria. ..." - CHURCH FATHERS: Synod of Laodicea (4th Century)
"... The Council of Laodicea was a regional synod of approximately thirty clerics from
Asia Minor that assembled about 363–364 AD in
Laodicea,
Phrygia Pacatiana. ..." -
Council of Laodicea - Wikipedia
It was in 'turkey'. True, yet if you consider the material in those 'canons', you will see that their decisions were based upon things that already existed previously.
Do you know why 'canon XXIX' was made?
Canon 16 'XVI' (Laodicea):
"The Gospels are to be read on the Sabbath [i.e. Saturday], with the other Scriptures.
... Neander (
Kirchengesch., 2d ed., vol. iij., p. 565
et seq.) suggests ... that it was the custom in many parts of the ancient Church to keep every Saturday as a feast in commemoration of the Creation. ...
...
Among the Greeks the Sabbath was kept ..." -
CHURCH FATHERS: Synod of Laodicea (4th Century)
The 'pope' of Rome (there were other 'popes'), didn't have to be at Laodicea as Sylvester I had already issued a statement on the thing before this 'synod'.
True. So?
You just stretched the evidence you gave beyond what it gives.
I saw how the source you used was stretched to support your a priori.
Yet, see the evidence I provided is against your stretching?
Done.