The Roman Catholic Church had nothing to do with changing the Sabbath to Sunday. They may claim that they did, but they make a lot of boastful claims that aren't true. This decision was made well before the Roman Catholic Church as we know existed.
Christians met with the Jews in the synagogue during the earlier years because that is where Scripture was kept..they did not have access to Scriptures of their own in many cases. They met on Sundays to discuss these Scriptures from a Christian context. They were kicked out of the synagogues in about AD90 by the Jews. This incident relates to the Eighteen Benedictions which were required recitation in the synagogues. One of the points was anti-Christian so they could not recite it in good conscience. They simply discontinued meeting with the Jews on Sabbath and continued meeting amongst themselves on Sunday.
The edict of Constantine in AD 321 did not prevent Sabbathkeepers from worshipping on the Sabbath. It merely required Sunday to be observed as a day of rest. Those who thought that the Sabbath still applied could rest on Saturday if they wanted. The vast majority of Christians were already meeting on the Sabbath well prior to 150 AD, anyways, so this edict affected few. Even SDA historian Samuele Bacchiocchi admitted this in his book "From Sabbath to Sunday", despite the story that Ellen G. White and the Seventh Day Adventist organization weaved in this regard.
In regards to the decision at Laodicea in AD363, the decision regarding Judaizing on the Sabbath was decided well before the Roman Catholic Church as we know it existed. Rome was only one of several bishoprics of the Church and had no such power. They had this kind of power after about 600 AD but not until then. So, blaming the Sabbath issue on the Catholic church is not historically tenable.
I don't believe the church should have made their decision concerning Judaizing but they were probably facing heretics as we do today which teach that the Old Covenant and ceremonial and ritualistic elements of it still apply to New Covenant Christians. We are not the nation of Israel, and were never parties to that covenant. Besides that, it is obsolete.
The reason I don't think they should have made this decision is because Jewish Christians should have been allowed the liberality of worshiping on Saturday if they wanted. The day that one worships upon should not be an issue at all, regardless of ones' preference.
Rome was only one of six or so bishoprics of the church at that time. It did not have the power to make that sort of decision. This is a conspiracy theory that some Sabbathkeepers have perpetuated. The origin is with the founders of the Seventh Day Adventist church, particularly Ellen G. White and Joseph Bates. Those who perpetuate it tend to claim that the Mark of the Beast is Sabbath-breaking and claim that both Catholicism and Protestantism is a counterfeit form of Christianity. While I agree that the Roman Catholic church is an apostate church, evangelical Protestantism is not.
Connecting Daniel 7:25 to the Sabbath rulings by the church is not reasonable. You don't know who those verses apply to, and what they apply to. They seem to have an end-time fulfillment rather than a fulfillment in history with the Catholic Church, as the verses afterwards speak of end-time events preceding the return of Christ.
Again, these sorts of assertions are an attempt to discredit Christians who meet on Sunday, usually made by cults who claim to be the true faith. They are usually led by contentious, divisive individuals. They want to discredit both Roman Catholicism and Protestantism and add to their own churches, which teach much error. The Armstrongite groups, for example, teach that they are the only true Church and that they are becoming perfected to be born into the Godhead as literal Gods in the resurrection.
I was a member of Worldwide Church of God, the parent organization of the Armstrongite movement, for 10 years. I understand the reasoning behind the typical Sabbathkeeping arguments. It seems to be a coherent argument but in reality it is a big conspiracy theory and those who are underneath this deception are sadly mistaken.
Colossians 2:16-17 says not to allow others to judge us regarding the issue of days. These verses also say that the Sabbath and Holy days are shadows, which is the same language that Hebrews 10:1-2 uses in regards to animal sacrifices. In addition, the Old Covenant is done away with so, these ceremonial and ritualistic aspects of the Law apply, and neither should Sabbathkeepers be judging Christians relating to this issue.