"The Roman Catholic church did not create the first day of the week, YHWH did that as was explained in Genesis. "
HUH?
Read Genesis gain Dennis,............ In No Way, Shape, nor Form, did YAHWEH proclaim the First Day of the Week, to be the Seventh Day Sabbath!
Constantine the Great's early "catholic church", changed that, & Made the Mesiah a Liar in doing it.
Mat 12:38 Then certain of the scribes and Pharisees answered, “Teacher, we want to see a sign from you.”
Mat 12:39 But he answered them, “An evil and adulterous generation seeks after a sign, but no sign will be given to it but the sign of Jonah the prophet.
Mat 12:40 For as Jonah was three days and three nights in the belly of the whale, so will the Son of Man be three days and three nights in the heart of the earth.
Constantine proclaimed "Good Friday evening to Easter Sunday morning", as the time of The Messiah being in the Grave!
Per Documents at the "Holy See"/Vatican Library, Constantine's church acknowledged the Seventh Day Sabbath, but stated that the First Day of the Week must be set up as a Memorial to The Messiah's (False) Resurrection. That quickly became Law in the Roman Empire, as well as The Sunday Sabbath.
But just as Blasphemous,... The catholic church instituted the Re-packaged "Feast of Ishtar", & labeled it "Easter".
All of these Blasphemous Lies, have been, in the Majority, been accepted, & still honored by "Christianity".