Easy cowboy, let's not be so quick to draw your gun.
First of all, if Jesus or the disciples ever tried to do away with the seventh day Sabbath you would have heard a huge outcry all throughout the New Testament, but you don't. Even such a small thing a making a change to the circumcision law almost split the church down the middle. There are whole chapters dedicated to it's debate.
We know how the New Covenant is based on the techings of Jesus and not once do you hear Jesus do away with the Sabbath. You do hear Him teach much on how to keep it holy in light of relationships. You even have Him rebuking people for keeping it in a legalistic manner. Even after the death of Jesus His followers still kept the Sabbath, according to the fourth commandment.
Luke 23:56 Then they returned and prepared spices and fragrant oils. And they rested on the Sabbath according to the commandment.
We even have Paul, before his conversion, going from synagogue to synagogue pulling Christians out of church to beat them and imprison them.
Acts 22:19 'Lord,' Paul answered, "they know that I used to go from synagogue to synagogue, imprisoning and flogging those who believed in you;
Long after Jesus' resurrection Paul taught both Jew and Gentile in the synagogue every Sabbath.
Acts 18:4 And he reasoned in the synagogue every sabbath, and persuaded Jews and Greeks.
How long did this go on before Paul left for his next jeourney?
Acts 18:4 And he reasoned in the synagogue every sabbath, and persuaded Jews and Greeks.
Paul, taught in the synagogue every Sabbath for a year and a half, that's a lot of Sabbaths.
At one point, many years after Jesus, the Gentiles begged that they could be taught again next Sabbath.
Acts 13:42 And when the Jews went out of the synagogue, the Gentiles begged that these words might be preached to them the next Sabbath.
Why not preach the next day, which would have been Sunday? As a matter of fact, almost the whole city came out the next Sabbath to hear the word of God be preached.
Acts 13:44 And the next Sabbath almost the whole city came together to hear the word of God.
Many years after Jesus, John was in the spirit on a day He called, the Lord's day. What day is the Lord's day? Well, the Bible says Jesus is Lord of the Sabbath so I would say the Sabbath is the Lord's day.
Now, as far as the chain of cerimonial days, drink, meat offerings and sabbath days, these days where institued as a result of sin to be used as shadows, which Jesus fulfilled so don't judge.
Ezekiel 45:17 And it shall be the prince's part to give burnt offerings, and meat offerings, and drink offerings, in the feasts, and in the new moons, and in the sabbaths, in all solemnities of the house of Israel: he shall prepare the sin offering, and the meat offering, and the burnt offering, and the peace offerings, to make reconciliation for the house of Israel.
There were many days called sabbaths all throughout the OT that were instituted as a result of sin and were not written in stne with God'sown finger but the holiness of the seventh day came before sin and was not given as a shadow.
You don't hear arguments in the NT regarding which day the Sabbath was because everyone knew which day it was so you wouldn't hear Jesus talk about it that way but you do hear Him teaching many times on how to keep it holy.