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 what words does Daniel foretell Christ's receiving His kingdom?
How many were embraced in God's promises to Abraham?
How does Abraham's experience show that obedience and faith are inseparable?
What question did the eunuch ask after Philip had preached Jesus unto him?
2. What attitude of rivalry was the Papacy, represented by the little horn, to assume toward the Most High?
What kind of mind is not subject to the law of God?
How did God reprove their disobedience?

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