My view on the Sabbath and why Christians worship on Sunday.
First, there are two important things to consider. 1. the Sabbath was given to Israel as the 'sign' of an everlasting Covenant between God and His people in remembrance that it was God who sanctified them (Exodus 31:13-16), and because they should remember God's work in bringing them out of the bondage of Egypt (Deuteronomy 5:13-15). 2. it was instituted as a day of rest from their labours (Exodus 31:17), coinciding with and commemorating God's rest from His. It was to be observed on the seventh day (saturday), and was to be a Holy day wherein their work would cease.
Now, Luke 6:4-5: "How he went into the house of God, and did take and eat the shewbread, and gave also to them that were with him; which it is not lawful to eat but for the priests alone? And he said unto them, That the Son of man is Lord also of the Sabbath."
The disciples could work on the Sabbath in the cornfield because Christ as high Priest and Lord of the Sabbath fulfilled the law for them. He is the Sabbath wherein they would find rest from the works of the law. For all of the old testament signs and ceremonial laws and ordinances were fulfilled (completed) in Christ at the cross. They were simply 'types' of the actual things which were to come. The Holy canon speaks of them as a [skia], meaning that they were merely shadows or the prefiguring of the reality which was to come.
Colossians 2:16: "Let no man therefore judge you in meat, or in drink, or in respect of an Holy day, or of the new moon, or of the Sabbath, which are a Shadow of things to come: but the body is of Christ!"
Here God tells us very plainly and 'without ambiguity' that the old testament Sabbath was a [skia] or shadow that pointed to a greater Sabbath to come. All of those old testament laws of Moses like not eating unclean meats, the ceremonial laws of Holy days, the ceremonial laws of the new moons, and right along with these God puts the old testament Sabbath, and says it was merely a 'shadow.' And like all these other laws, it would have it's substance, efficacy, and fulfillment in the person of Jesus Christ, the true it pictured. We are not to be judged by any of these, as the law of these are kept in Christ. We would no more go back to observe the seventh day Sabbath today as we would go back to the Passover, or observe the new moons, or continue the old testament laws of eating meats, or of going to Jerusalem three times a year (Feast of Tabernacles, Passover, Weeks). They were shadows of what has now come. Likewise, Christ is that Sabbath of Rest the children of God looked for, and it has come.
This is explained in Hebrews chapter four. I would suggest everyone very carefully read that chapter of Christ our Rest. His rising from the dead fulfills it and His coming again the consummation of it so that there still remains a Rest for us. When we work six days and rest on the seventh, we bear witness to the Sabbath cycle ordained by God. And God makes it clear that there is a greater rest which is being prepared for those who have Christ as their Sabbath.
God used His directed light of scripture to show the Saints shadows of things that were to come. These are spoken of as signs or tokens. They are the 'types or figures' of the true thing that God had in view from the very beginning. The types forecast things which were to come in God's plan of Salvation. And in this way the Sabbath was a sign of the coming of Christ, our Rest wherein we would cease from our labours. He was the true or the fulfilment of that seventh day Sabbath sign. It is only in Him that any of us would see rest.
We see the same principle when the old testament law commanded that the sacrifice of the passover Lamb was to be kept forever. That was not the real or true, it was the shadow of the true sacrifice Lamb that was to come. Only in Christ would this law be kept forever. By using these old testament laws, God was using shadows and types to illustrate future prophesy. So when Christ came, the law was fulfilled. When the prophecy of the sacrifice passover Lamb was fulfilled, then the practice of observing the shadow (sign of sacrificing a literal lamb) was over. The everlasting law wasn't done away with, it was completed or 'come to fruition' in Christ.
Matthew 5:17 : "Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil".
The law was completed or fulfilled. Christ didn't do away with the old testament laws, He was that to which those laws pointed. He is the fruition of them.
Luke 24:44 :"And he said unto them, These are the words which I spake unto you, while I was yet with you, that all things must be fulfilled, which were written in the law of Moses, and in the prophets, and in the psalms, concerning me."
Christ fulfilled these old covenant laws which pointed to Him. We now celebrate Christ (the passover Lamb) by the communion service in remembrance of his broken body. In other words, we now recognize that the law of Moses in actual sacrificing of an animal, was merely an old testament 'sign' pointing to the real sacrifice of his body. And with the coming of the real, our eyes are upon it and not any longer upon the 'sign' looking forward to it. We are now looking backward. i.e., the old testament law of the 'passover sacrifice' looked forward to the broken body of Christ, the 'communion service' looks back at the broken body of Christ. The method of observance has changed, but the observance has not. In Christ, we keep the law of the passover forever. The blood of the passover lamb in the true, shed once, and for all.
Hebrews 10:1-2: "for the law having a Shadow of good things to come, and not the very Image of the things, can never with those sacrifices which they offered year by year continually make the comers thereunto perfect."
The literal Temple was a shadow of Christ, the true Temple and the veil of the Temple a shadow of His flesh (Hebrews 9:3; 10:20), the High Priests were a shadow of Christ our High Priest who makes intercession for us, the sacrifice Lamb was a shadow that Christ was the true sacrifice Lamb, the lamps were a shadow that Christ was the light of the world, the Passover a shadow that the judgment of God will pass over us as it did the children of Israel, The feast of firstfruits (Pentecost) a shadow that He is our Firstfruits, and the seventh day Sabbath a shadow of Christ, who is our Rest wherein we do no work (Salvation by Grace) to obtain favor of God. They all were looking forward to the true or real that came with Christ.
It is important to understand that this seventh day was fulfilled in Christ in that the works that He 'finished' for us, is what allows us to enter into that Sabbath or Rest. Old things are become new so that in new testament dispensation, the old signs and laws in Christ were completed. With the new Temple the old by law is to be observed no longer. The new is observed in Christ. With the new Passover feast (The Lord's Supper) the old is to be observed by law no longer. With a new High Priest, the old is to be observed by law no longer. With a new sign of Salvation (baptism) the old (of circumcision) is to be observed by law no longer. And with a new Sabbath day (Not a new Sabbath), the old testament day is to be observed by law no longer. We observe it faithfully (as all the old testament everlasting commands of the law) in Christ. And stated, God indeed told us plainly from the start that it was a 'sign' or signification.
We got Jewish roots/family so that's our interest. Huh? I'm scratching my head. I hate not understanding. 
I truly want to know how christians celebrate sabbath. I'd heard that there is a call for people to return to it.
We close the Sabbath similar to how we opened it. Songs first (especially like "Day is Dying in the West"), study follows and then prayer. 
Because God's Sabbath is such a special time...
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