This material poses the question as to whether Sunday is the Sabbath spoken of in the Bible and ordained by God as a day of worship and rest. In fact, there is overwhelming evidence that the Sabbath day was changed from Saturday (the 7th day of the week), to Sunday (the 1st day of the week). The change was made by the Roman Catholic Church as a mark of it's authority over the Bible. In fact, the change was made to challenge the authority of God Himself and elevate the authority of the Pope over God and His divine and eternal laws.
For more information about this, go to Catholicism