lol...it's difficult to trace the history of sabbath keeping Christians through the traditional churches that's true. The observance of the Lord's sabbath was officially banned about 300 years after the death of Christ in the council of Laodecia. After that it becomes difficult to find sabbath keeping communities...if they were vocal they were persecuted so not much history has been written since then.
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...