Why? The papacy says if you're going to go by the evidence of Scripture alone, you should keep Saturday holy.
"People who think that the Scriptures should be the sole authority should logically become Seventh-day Adventists and keep Saturday holy." St. Catherine Catholic Church Sentinel, May 21, 1995
Dead Bread, any thinking person understands that a reference to "the Scriptures"
includes both the implicit and explicit teachings of it. Therefore, when the papacy insists that those who make "the Scriptures" their sole authority - both the implicit and explicit teachings of it - they should ignore Sunday and keep the 7th day Sabbath because Sunday sacredness is no where to be found in Scripture, implicit or otherwise. Even a blind man can see this.