saturday vs sunday

Christ rose on Easter Sunday and Matthew, Mark, Luke and John all four books you can find clearly teach that Christ rose the first day of the week, now the Gregorian calendar and the romish calendar have never had a mistake and always Sunday is the first day of the week but above that point God...

Catholic answers - address this question about "changing" the Sabbath from one day to another. ============================================= "Seventh-day Adventists insist that the Catholic Church has no scriptural warrant for changing the Sabbath from Saturday to Sunday. Is this true?"...