I agree with you that the case can be made, although I don't know how much I agree with your case, and I still think the case is stronger against a mandatory Sa

I agree with you that the case can be made, although I don't know how much I agree with your case, and I still think the case is stronger against a mandatory Sabbath. Hebrews 4 talks a lot about entering into Sabbath rest. But my interpretation of its main gist is that those who believe and obey the good news enter into God's Sabbath rest. I don't think it's speaking about a literal Sabbath day. I agree that early Jewish Christians probably practiced the Sabbath, but did early Gentile Christians? There are also passages in the NT, such as Romans 14 and Colossians 2:16-17, which support the idea that a Christian has freedom to practice an explicit Sabbath day or to not practice it. So I concur with you that, in Christianity, taking an explicit Sabbath day is permissible and even beneficial. I just don't think it is mandated, and I think a Christian can legitimately believe that he/she shouldn't take an explicit Sabbath day.