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.

In contrast with the pride and self-exaltation exhibited by Satan, what spirit did Christ manifest?
How was Christ's first advent to be heralded?
What is a \"wind of doctrine\"?
At what cost did even He learn the lesson of obedience?
By what other terms are these covenants designated?
What besides creation were Israel to remember when they kept the Sabbath?
Is this chastening a pleasant experience?

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