Short version: Even in the Apostles' time, it was customary for Yeshua's disciples to both go to synagogue on the Sabbath and to have a fellowship dinner after sundown Saturday night, which because of how Jewish days are tracked (sundown to sundown) would be considered to be the 1st day of the week, the day of the Resurrection. As the synagogues became more hostile to the Nazarenes in general and the Gentile Christians in particular, the Saturday night meeting became the mainstay of the Church. In many places, this started wrapping around to Sunday morning.
After the Bar Kochba revolt pretty much resulted in the Empire declaring war on Judaism, the Greek and Roman Christians had every motivation to distance themselves from the hated Jews. This resulted in a huge debate on Sabbath vs. Sunday and keeping Pascha on the Jewish calendar or just making up a date on the Roman one that carried on until the Council of Nicea formally renounced all Jewish practice in the Christian Church.
Once Roman anti-Semitism settled into the Church and European culture in general, there was never much of a reason to revisit the issue, so everyone just passed down Sunday as the holy day. This fit with the narrative of the Roman Catholic Church that it had the authority to change God's law, but Protestants were so used to Sunday that there were few attempts to change it back.
In a way, I don't mind since the Church having distinctive holidays apart from the Jews helped to preserve the latter as a distinct people. However, the fact is that the Church actively purged any hint of Jewishness out of those Jews who did come to faith in the King of the Jews, thus preaching a false gospel to the Jews.
I've got some blog posts on the subject entitled Judenrein Christianity if you'd like to see it.
Shalom!
Short version:
Judenrein Christianity
We would like to think that “true Christians” would never visit such harm on the Jews,
There are some words in the translations that may be off a little, i just read every thing surrounding the scripture to get the picture. i do not believe in religion so i do not have be able to speak any other language.
My daughter both speaks and reads Hebrew ( at least i think it is Hebrew ) when she wants to but i have no idea what she is talking about even when she is speaking in English.
She wants to go into all of the philosophy and literature which i care nothing about.
But i guess i will have to get into the Judenrein Christianity to see if i can understand it.
My daughter only went through the eighth grade and i did not get that far.