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.

How was the earth itself affected by Adam's sin ?
How intimate is His union with believers?
How does he emphasize the reliability of prophecy?
What two covenants are contrasted in the Bible?
What was to take place under the third trumpet?
Why did God give His only begotten Son to the world?
Referring to Peter's coming sore trial, for what did Christ say He had prayed?

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