you mean.....The Catholic Sabbath?????
Little "c" catholic, yes. I'm sure from your understanding of church history you can figure it out.
Now, will you also affirm that yours is the habit of the cults?
I believe the sabbath principle of one day in seven as outlined in the 4th commandment is eternally binding on all men in all ages. I also believe that the particular day of the week was not eternally set, and that under the old covenant the weekly sabbath was on the last day while under the new covenant the weekly sabbath/Lord's Day has been the first day of the week.
Exodus 20:10 says, "... but the seventh day is the Sabbath of the Lord your God." Note that it does not say the sabbath day is the seventh day. It says the seventh day is the sabbath day. And so it was under the old covenant, just as new moons and feast days were also designated as sabbath days.
While the day could change (and did according to the apostles) the principle of one day in seven remains the eternal. That is why it is placed among the Ten Words written by the finger of God Himself.