Catholics have long held that in communion the body and blood of Christ are reformed in the communion bread and cup. A doctrine called transubstantiation. Of course non-catholics disagree stating it is a remembrance of Christ's body and blood at the time of his crucifixion and death, not a present tense death and offering of Christ but a remembrance of what was done at the cross. Catholics will admit it is a remembrance but demand it to be much greater than just a remembrance. They tend to make everything as grandois as possible, making their service more holy than the next church. Its not necessarily holiness if done in pride and arrogance to over shadow other people. In that case it would be sinful. It would also violate Christ's command not to do your alms before men to be seen of men. Remember Christ condemned broadened phylacteries that made old testament priests appear holy. Same concept here, doing more and greater to appear holy.
The Sabbath tends to disprove Catholic theology because the Ten Commands had a remembrance clause just as the Lord's Supper did.
Remember the Sabbath day
This do in remembrance
Both are a remembrance, one is the rest given when Israel was set free from Egypt. The sabbath day remembrance wasn't a literal transportation back into Egypt to relive the deaths of the firstborn and the Exodus as Pharoah said Go you are free. The sabboth of the creation 7th day is a remembrance of God resting from creation, the Sabboth of the Exodus remembers freedom from Pharoah, remembering them isn't a present day redooing, the effects are ongoing so that the effects don't depend upon a modern priest making those Sabboths legally active, the sabbath stays active from that day forward and we only have to remember it is in force. God's rest from creation is ongoing, Israel's rest from Pharoah is ongoing, and the rest given in Christ is ongoing. There is no need to re-sacrifice every Sunday. That is blaspheme against God, to think what God finished man must sustain.
Catholics have used John 6 to say Christ's body is bread that comes down from heaven every communion, but that violates the Sabbath reality. In the Law they received a double portion on Friday so they would not collect on Saturday.
In the law no bread from heaven fell on the sabbath, only 6 days did it fall. So to require Christ's body to fall from heaven on Sunday misrepresents the whole concept, we receive a daily portion remembered at the end of the week. There is no provision in the New Testament for Christ's body and blood to fall from heaven on Sunday, Christians receive it daily in faith, Christ is given daily as the manna was, given over 6 days not on the Sabbath day, this kept the Sabbath Holy as a concocation and remembrance. Christ died Friday and not Saturday. Resurrection was Sunday. Also, the manna had an end, it stopped just as Christ's sacrifice was completed. Christ isn't being reincarnated every Sunday, he was made incarnate once. John 6 is about the incarnation as much as anything else. He died once and was resurrected once. Does God need us to resurrect him every week or is God's work in that area completed with lasting effects? The sacrafice was completed with lasting effects, our job is to remember it.
The 10 commands didn't create the sabbath but formed how to remember what already was, God rested from creation, Israel rested and was long gone from Egypt, Christ finished his work, New Testament commands simply form a pattern in remembering Christ's crucifixion, his work and our rest.