I don't think I am the one missing the point. Christ is our salvation rest but in Christ rest there is no sin including not obeying the 4th commandment. Read Isa 48:18. The Sabbath is a commandment of God thus saith the Lord. In Christ rest there is only peace, not rebellion to any of His commandments. Its actually the whole point of Hebrews 4.You miss the point. Believing Christ for our salvation is the rest.
2nd time with this question: did anyone keep the OT Sabbath apart from faith?
We can't keep any law without faith or love. If we try to keep the law without love, its works.