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 positive assurance of the resurrection is given?
By what law is the knowledge of sin?
What will he one of the last great signs performed by this means, to fasten men in deception?
What is implied in a knowledge of God and Jesus Christ?
Whom does the Lord chasten?
What is promised those who trust in Jesus?
In what is the Christian to grow?

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