There's a simple answer to this question. If you think that the 4th commandment isn't binding anymore, then you also have to believe that all of the commandments aren't binding anymore, but that can't be true because Jesus Himself kept the commandments including the fourth one. He observed the Sabbath. Since we are to follow his example, it seems logical that we should keep the Sabbath as well.
God bless you all, love and peace to all of you.
Isa 28:10 For precept must be upon precept, precept upon precept; line upon line, line upon line; here a little, and there a little:
Isa 28:11 For with stammering lips and another tongue will he speak to this people.
Isa 28:12 To whom he said, This is the rest wherewith ye may cause the weary to rest; and this is the refreshing: yet they would not hear.
We are to keep the 4th commandment but in the New Testament it is a spiritual rest by the Holy Spirit.
Col 2:14 Blotting out the handwriting of ordinances that was against us, which was contrary to us, and took it out of the way, nailing it to his cross;
Col 2:15 And having spoiled principalities and powers, he made a shew of them openly, triumphing over them in it.
Col 2:16 Let no man therefore judge you in meat, or in drink, or in respect of an holyday, or of the new moon, or of the sabbath days:
Col 2:17 Which are a shadow of things to come; but the body is of Christ.
Jesus took the physical ordinances of Israel out of the way nailing them to His cross for they were contrary to us because they had no bearing on spiritual salvation.
The sabbath days was a shadow of things to come but the body is of Christ which is by the Holy Spirit.
Joh 14:2 In my Father's house are many mansions: if it were not so, I would have told you. I go to prepare a place for you.
Joh 14:3 And if I go and prepare a place for you, I will come again, and receive you unto myself; that where I am, there ye may be also.
Luk 17:20 And when he was demanded of the Pharisees, when the kingdom of God should come, he answered them and said, The kingdom of God cometh not with observation:
Luk 17:21 Neither shall they say, Lo here! or, lo there! for, behold, the kingdom of God is within you.
The kingdom of God is within you when you have the Holy Spirit and you celebrate the new creation that Jesus went away to prepare for the saints the New Jerusalem.
In the New Testament it is a spiritual rest by the Holy Spirit.