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 relation does faith bear to knowledge?
What is the great purpose of Christ in His work of reconciliation?
What was to be the nature of the next kingdom after Babylon?
What was He to take away in the midst of this week?
What is the love of God?
When God was about to proclaim His law to Israel, of what did He tell Moses to remind them?
What does Paul say of their number?

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