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 whom has God made us accepted?
What will result if correction is withheld?
9. What prophetic period extends to the time of the cleansing of the sanctuary, or the investigative judgment?
5. What will be the dragon's attitude toward the remnant people who keep the commandments of God?
When did Paul expect to receive his crown?
What did it lead Moses to do?
How extensive will be the reign of Christ?

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