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 way was Jonah a type of Christ?
Under what figure was the Christian church represented to the Apostle John?
7. What did He say of the wars, famines, pestilences, and earthquakes which were to precede these events?
Because of disobedience, what experience came to Israel ?
What takes place under the sixth plague?
Is this chastening a pleasant experience?
What encouragement is held out concerning the branches which have been broken off?

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