It’s not only Sabbatarianism but the Holy Trinity as well.
Your view would mean the Church went very wrong very early, in apostolic times - without historical proof of that view.
Nor scriptural proof, but I concede that via sola scriptura one can have scripture say a wide variety of heresy. There is historical proof for that.
thanks for your reply...
Let me begin to answer with a question so I know where you're approaching this question from.
Do you believe that the authors of scripture, both old and new testaments, understood the trinity doctrine exactly as you and other Christians today understand it?