(1)Because posting something in supersize font plus bold letters is the online equivalent of shouting at the top of your lungs.
(2) Because you provided a fraudulent quote as your leadoff argument.
At face value your "question" was a provocation.
Had your question been sincere it would probably have been written in words like:
"The Catholic Church holds it worship services on Sundays and calls that day the Lord's Day. What Scriptural reasoning is behind this practice?" And it would probably ahve been written in regular font and unaccompanied by faked quotes.
The text linked to Post 28 is shown here. The hyperlinks are not included. One would have to go to the site to access them. Much obliged, wideawake!
This article presents the arguments of the Seventh Day Adventists for celebrating the Sabbath on the seventh day of the week. Following this are eight reasons explaining that the Sabbath has been replaced with the eighth day- that is the first day - of the week, the Lord’s Day - and how the early church understood this to be so. Click on the underlined words to go to that section.
1. JESUS’S AUTHORITY: Jesus has complete authority over the Sabbath and the right to change it in any way He wishes to.
2. PURPOSE AND MEANING: The purpose and the meaning of the Sabbath are better and more perfectly fulfilled by the first day of the week.
3. BETTER SABBATH PREFIGURED: and TYPES: The better Sabbath of the New Covenant, the first day, was prefigured in the Old Testament.
4. TWO ASPECTS: The Sabbath of the Old Covenant had two aspects. Only the ritual aspect of the seventh day has changed. The spiritual aspect of celebrating our covenant relationship with God every seven days is the only permanent binding aspect.
5. COVENANT: The Sabbath was a sign of the Old Covenant which is no longer binding.
6. FIRST DAY OF THE WEEK: The Sabbath has been replaced by the First Day of the week, the Lord’s Day.
7. CHRIST HONORS THE FIRST DAY: Christ honored the first day of the week which is our new seventh day.
8. NEW CREATION: God rested on the seventh day and the Old Covenant focused on His Creation of the world. Christians are a new creation in Christ and He has given us a new and better seventh day.
9. EARLY WRITERS: The early writers of the Church show that the followers of the Apostles and Christ understood that the Sabbath had been replaced by the First Day.
QUESTION
Why do Catholics work on Saturday ? Exodus 20:8-10 “Remember the sabbath day, to keep it holy. Six days you shall labor, and do all your work; but the seventh day is a sabbath to the Lord your God; in it you shall not do any work…” RSV And the Sabbath has been established as a “perpetual covenant.” Exodus 31:16-18 “Therefore the people of Israel shall keep the sabbath, observing the sabbath throughout their generations, as a perpetual covenant. …And he gave to Moses… the two tables of the testimony, tables of stone, written with the finger of God.” With the dramatic event of God writing these commandments with His own finger “in stone” He shows that the Sabbath would last forever. After all, we Seventh Day Adventists claim that Jesus honored the Sabbath by resting in the tomb on the seventh day and waited until the first day to work His miracle of the Resurrection.
Hebrews 13:8 “Jesus Christ is the same yesterday and today and for ever.”
Matthew 5:17-18 “Think not that I have come to abolish the law and the prophets; I have come not to abolish them but to fulfil them. For truly, I say to you, till heaven and earth pass away, not an iota, not a dot, will pass from the law until all is accomplished.” RSV
Click below for the Answer
1. JESUS’S AUTHORITY:
2. PURPOSE AND MEANING:
3. BETTER SABBATH PREFIGURED: and TYPES:
4. TWO ASPECTS:
5. COVENANT:
6. FIRST DAY OF THE WEEK:
7. CHRIST HONORS THE FIRST DAY:
8. NEW CREATION:
9. EARLY WRITERS of the Church