By what authority was Sunday Sabbath-keeping instituted?

Answer

By the authority of the Catholic Church. See page 131.

Is there salvation through any other?
9. What prophetic period extends to the time of the cleansing of the sanctuary, or the investigative judgment?
Who is the real power operating through the beast and his image, and demanding worship?
By what are all men proved guilty?
Who is responsible for the present state Sunday laws of the United States?
Will even this terrible judgment lead men to repent?
For what purpose did Christ say God had anointed Him?

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