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 is the means through which this justifying grace is made available to the sinner?
What will God allow to come to those who reject truth?
What change did Daniel see take place in these horns?
What proposition did He submit to them?
What will this power propose that the people shall do?
To whom does the Sabbath belong?
How did the Apostle Peter say the message of the Lord's coming would be treated by some?

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