Thanks for your very well-done post on the Lord’s Day.
I’ve seen a range of beliefs on FR, at the other edge are the Messianic Jews. The difference between being Jews and being Christians of course goes back to the first council. If you have a Church with authority as existed at the first and future councils, then the issues can be decided, with authority.
However if all you have, after you leave the Church is sola scriptura, you have the scriptures of both Jews and only Christians. With individual interpretation and authority a wide range of mixtures can be expected. From the Messianic Jews who attempt to follow Judaism only with a Messiah (some hold Christ is divine, some not, some trinitarians, some not, etc.) to Roamer who chooses the Jewish Sabbath over the Lord’s Day. And everything in between - OPC-types who emphasize the harsher aspects of the OT over the “God loves you” message of Jesus for example.
It surprised me that the question was so difficult to answer for some. Perhaps it is because it is indicative of a foundational problem in sola scriptura.
Thanks again for your post.