You say "Catholic" like it's a bad thing.
Much of what that Church (Catholic) teaches is false doctrine not supported by any scripture.....and in some cases diametrically opposed. So....the first day of the week, i.e. "The Venerable Day of the Sun" according to God's word, is not the Sabbath. But, the Catholic church and her daughters, the Protestants, say it is.
Here we have a controversy that is substantiated by the "Romans" with the fact they claim they can make it up as they go along. I'll take the side of scripture in this case because it says no where to ignore God's Holy Sabbaths and it can be shown conclusively that the Early Church did "not" ignore them. This is totally a man made tradition.....and I am not a Sola Scriptura person at all.
The "Catholic Sabbath" is a bad thing.....although I personally know many, fine, God fearing Catholic men and women.....some even members of this forum.
Jude: You say "Catholic" like it's a bad thing.
I'm as critical of the Romanists as the next Protestant, but they didn't get everything wrong. They still worship the Trinitarian God.
And as Topcat pointed out, the "holy catholic church" exists on earth and is made up of all true believers. And for 2,000 years the vast majority of those believers have held to a Sunday sabbath at the beginning of a new week, a new covenant and a new life in Christ.