Colossians 2, you wrongly use, see this thread:
Colossians 2, a study
As for Rome's own position at the highest levels (rather than your level, and make no mistake, there are 'levels' as per Ignatius):
"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 to Sunday is proof positive of that fact. Deny the authority of the Church and you have no adequate or reasonable explanation or justification for the substitution of Sunday for Saturday in the Third - Protestant Fourth - Commandment of God." - Source: The Catholic Record, London, Ontario Canada, September 1, 1923.- see source from Liberty Magazine Volumes 16-20, all this, the Roman and Seventh Day Adventist, in a response to speech given by Baptist minister [Emmanuel Baptist Church, Toronto Canada] Rev. J. Marion Smith on the Sabbath/Sunday question [google books pagination 14-15] - Liberty
“...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
Additional statements from Cardinal Gibbons in further material, such as found in "Faith of our Fathers" google books pagination 108, "The Church and the Bible";
"...is not every Christian obliged to 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." - Faith of Our Fathers 1877 and as such at the beginning in the Introduction it is clearly said,
"...in which the doctrines of the Roman Catholic Church are expounded by one of her own sons."