Kevin I agree that baptism does not literally kill and resurrect the believer but this is water baptism that is a public celebration of the reality of the baptism of the Holy Spirit. The baptism in Romans 6 comes from what John the Baptist was talking about at the baptism of Jesus. There the Holy Spirit descended. John explained that he baptised with water but added about Jesus, “this is the One who baptizes in the Holy Spirit.” This is the baptism in which our old self was crucified and we rise to walk in newness of life. Nothing short of the power of the crucified and risen Christ, working through the Holy Spirit on and in human hearts, can accomplish this new birth of our spiritual nature.
Likewise, the Lord’s supper is a celebration of the new covenant in Christ’s blood in which we remember the Lord’s death till He comes. In the early Christian Gentile churches the resurrection day was widely chosen to celebrate this supper.
The Sabbath under the new covenant is described as a shadow compared to the rest we have in Christ. It’s like the whole of the old covenant that was but a shadow, not the reality. To enter God’s rest is not to rest one day in seven. To enter God’s rest is to rest in Christ every moment of every day. God lives in us and in Him we rest. It’s not about what we do. It’s about what Christ has done and then how this impacts our daily living.
This does not negate the “custom” of a day for corporate worship and rest from work.