And upon her forehead was a name written, MYSTERY, BABYLON THE GREAT, THE MOTHER OF HARLOTS AND ABOMINATIONS OF THE EARTH. Revelation 17:5
"The Catholic Times and Catholic Opinion gives an account of the 
first of a course of “Catholic Evidence” lectures at the Central Hall, Acton, by Monsignore Vaughn, on the relation of the Catholic Church to the Bible, and says:
In the course of a splendid address he showed that while Protestants rely upon the Bible and the Bible only, they did not stick up to it, and gave several instances of their inconsistency, including their keeping the Sunday as their Sabbath instead of Saturday.
It will be hard for the most of professed Protestants to repel this charge.
The keeping of Sunday instead of the Sabbath of the Bible is the thing which marks the most of the churches of Protestantism as true daughters of the Roman Catholic Church."
E.J.Waggoner