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 home did God make for man in the beginning?
What application did Jesus make of this prophecy?
What remarkable experience attended the baptism of Jesus?
From what time was Christ, the Word, associated with God, the Father?
What is Neander's conclusion regarding this theory?
Where had the prophet said Christ should he born?
What great gathering yet awaits God's people?

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