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.

Whom are all called upon to worship?
Who is this dragon?
Can there be sin where there is no law?
When did David say he would be satisfied?
Does Jesus sympathize with us in our afflictions?
What petitions may we confidently expect God to hear?
How extensive will be the reign of Christ?

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