You are arguing from an abstract, because it is widely accepted, in all academic circles, that the few Gentiles, who were in the synagogues, were at best "god fearers", as you have been shown. Do you have any clear doctrine, from Peter, John, or Paul, in any form, in an imperative manner, to show that the church, was bound by Sabbath law?
Any commands, any teaching, other than this fallacious repetitive posting you are doing, which proves nothing, we need doctrine please. This is a theology forum, not a speculation forum. I challenge, you because you started the thread, but so far have not provided doctrine, teaching, etc. Paul talk the time to talk of head coverings in Corinth, why would Sabbath be ignored? Thank you very much.