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.

With whom did sin originate?
What is proved by any attempt to be justified by the law?
What effect did the preaching of the Apostle Paul have upon the Gentiles?
What is said of the little horn as compared with the ten horns of the fourth beast of Daniel 7?
With what words did God admonish Cain?
When and by whom was the Sabbath made?
Is Christ ever called an angel?

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