I think he was more refering to you saying that Constantine changed It to sunday.
One must remember that our language and name for the days is not universal. For example in spanish, sunday is domingo, litterally, the Lord’s day.
Many would claim that Sunday worship goes all the way back to acts of the Apostles (I believe, I could be wrong) when it says they gathered on the first day of the week, the Lord’s day, to sing hymns to God.
I am not sure what the Latin days of the week are, but I doubt very much that Sunday was dedicated to Sol Invictus, as the rest of the days of the week come from German, and not Roman gods.
Satur’s (another name for Loki) day
A lone Raven
p.s. I and most Catholics would be against such a law, as it would forbid worship everyday, and on our Holy Days, We do not worship just on sunday.
upon research, it appears Sunday is a Roman custom as well (almost all of the germanic and roman gods match up as far as roles in the week, tew with mars (gods of war), frei with venus (gods of love), etc.
However, there is evidence predating constantine of a change in the day of worship. Christians worshipping on the first day rather than the last, there is even Roman writings of Christians and their “Agape” meals on the first day of the week.