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.

Of whom was Christ to be born?
13. In this same prophecy, how is the Church of Rome, the Papacy, designated as the antitype of ancient Babylon?
What is the essential principle of the law of God?
BY whom was the Ten Commandment law proclaimed?
What did Christ say would he the result if the days of persecution were not shortened?
What promise did Christ make concerning His coming?
Is there any limit to God's ability to help?

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