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.

To what parts of the ancient armour is faith compared?
What change is thus brought about?
How are those described who accept this message?
Whose example are we urged to imitate?
Whose destruction was made certain by the death of Christ ?
22. In what announcement in the New Testament is the establishment of the kingdom of God made known?
21. What scripture shows that Satan is to work with special power and deceptive wonders just before Christ's second coming?

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