My friend, I think you are closer to your understanding than you think and give yourself credit for.
You are correct; the Gospel according to Mark, clearly specifies the days involving Jesus' crucifixion, 'rest' in the tomb, and resurrection on the first day of the following week. Our God was crucified on Friday; and with fear of the disciples coming to rescue him and let him down from the God forsaken Tree the next day, breaking the sabbath commandment, it was ordered to break the legs of the three on the cross as to expedite the death. However, when they saw Jesus already dead, they never broke his legs (fulfilling prophecy of the sacrificial lamb offering of the Passover - no bone was to be broken).
Nicodemus used his influence to persuade the rulers to let them take Christ from the cross and bury him in the tomb that Nicodemus had purchased for himself. Christ then rested the whole of the sabbath day (evening of Friday - evening of Saturday) It was after sundown Saturday, that Jesus arose from the tomb and was resurrected. The mere fact that Jesus rested on the sabbath day testifies to the Law's authority.
There is not one biblical reference that alludes to the substitution of Sunday for Saturday's sabbath. Really all that needs to be discovered on this topic is the Catholic source herself which states the following:
“Most Christians assume that Sunday is the biblically approved day of worship. The Catholic Church protests that it transferred Christian worship from the biblical Sabbath (Saturday) to Sunday, and that to try to argue that the change was made in the Bible is both dishonest and a denial of Catholic authority. If Protestantism wants to base its teachings only on the Bible, it should worship on Saturday.” Rome’s Challenge www.immaculateheart.com/maryonline Dec 2003
“Is not every Christian obliged to sanctify Sunday and to abstain on that day from unnecessary servile work? Is not the observance of this law among the most prominent of our sacred duties? But you may read the Bible from Genesis to Revelation, and you will not find a single line authorizing the sanctification of Sunday. The Scriptures enforce the religious observance of Saturday, a day which we never sanctify.” James Cardinal Gibbons, The Faith of Our Fathers (1917 edition), p. 72-73 (16th Edition, p 111; 88th Edition, p. 89).
“For example, nowhere in the Bible do we find that Christ or the Apostles ordered that the Sabbath be changed from Saturday to Sunday. We have the commandment of God given to Moses to keep holy the Sabbath day, that is the 7th day of the week, Saturday. Today most Christians keep Sunday because it has been revealed to us by the [Roman Catholic] church outside the Bible.” Catholic Virginian, October 3, 1947, p. 9, article “To Tell You the Truth.”
The verse of Acts 20:7 as mentioned before is incomplete and inaccurate. The full verse reads as follows: "And upon the first day of the week, when the disciples came together to break bread, Paul preached unto them, ready to depart on the morrow; and continued his speech until midnight."
In order to fully comprehend this verse, we must remember the Hebrew definition of the day (sundown to sundown). And any portion of the day is considered a full day in reckoning and retelling; this is how we can reconcile the idea that Christ died and in three days he was resurrected. It only works with the standard Hebrew day system. The disciples met on Saturday in breaking bread. And after sundown came, the Hebrew day became Sunday. And being ready to depart on the morrow (Sunday) he preached until midnight.
It is difficult to fully abandon our indoctrinated way of midnight-to-midnight reckoning of the calendar weekdays, so it does take a little bit of thought to fully grasp the timeline in this story; but I think if anyone is earnestly looking for truth, they will be able to understand this verse.
Not to mention we can see that the Catholic Church herself changed the Ten Commandments that were written by God, in Stone (unchanging).
The Ten Commandments compared (the-ten-commandments.org)
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