Greetings in the precious Name of our Lord and Saviour, Jesus Christ.
Thank you for the link. The article: Why the Protestant Reformation Failed! Is an outrageous distortion of the facts. The author of this article evidently has a major axe to grind, in promoting the Seventh Day Adventist position, that we should be adhering to the Jewish seventh-day Sabbath and not the Christian Lord’s Day on the first day of the week.
I'm well acquainted with these arguments, and they are a dead end street. The early Christian Church gathered for worship: “on the first day of the week” (Acts 20:7; 1 Corinthians 16:2; Revelation 1:10).