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>>”Indeed, what was formerly a Jewish Sabbath of Saturday observed for centuries was now the First Day of the Week” <<
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Typical error of ignorance.
The only ‘first day’ worship that the early and true assembly ever respected was held at the beginning of that “work day” on what you Romans call Saturday evening. it was a potluck dinner and Bible study, called Havdalah.
The “mystery of iniquity” eventually brought about the serious depredation of that true worship.
That’s not how The early Apostles saw it. Read, Benedict XVI, The Early Church. It’s heavily footnoted just like the scholar he is.
No, more like institutional disobedience. Lawlessness.
Did Yahovah REALLY say... ??
And thus easy to dismiss whole: For the only standard to determine the truth of a doctrine, or a prophet, or anything else, is whether it keeps Torah.