Do Protestant writers acknowledge the same?

Answer

They do.
NOTE - "IS there no express commandment for observing the first day of the week as Sabbath,
instead of the seventh day?-None whatever. Neither Christ, nor His apostles, nor the first Christians
celebrated the first day of the week instead of the seventh as the Sabbath."-New York Weekly Tribune,
May 24, 1900.
"The Scriptures nowhere call the first day of the week the Sabbath. . . . There is no Scriptural
authority for so doing, nor of course any Scriptural obligation." The Watchman (Baptist).
"The observance of the first instead of the seventh day rests on the testimony of the church, and
the church alone.' -- Hobart Church News, July 2, 1894.
For additional testimonies, see reading on page 146.

What great exchange has been wrought for us in Christ?
What is assured to the believer in Christ?
In whose name should everything be done?
What call was made to come out of Babylon?
What positive declaration does the apostle then make?
What is one evidence that one has a knowledge of God?
Why, after the fall, was man shut away from the tree of life?

Questions & Answers are from the book Bible Readings for the Home Circle