Well Saturday is pagan Saturday, since it is dedicated to Saturn! So you went from one pagan god to another. That's all (if you want to take this to the absurd limits).
Do you know anything about Saturn and Saturday?
Saturday: named after the Roman god Saturn associated with the Titan Cronus, father of Zeus and many Olympians. Its original Anglo-Saxon rendering was Sæturnesdæg (pronounced [ˈsæturnezdæj]). In Latin, it was dies Saturni, "Day of Saturn".
Saturn is connected with human sacrifices, orgies of rampant gluttony and drunkenness, gambling, role reversal (slaves becoming masters for a day and vice versa), "the lord of misrule", the feast of fools, gag gifts, etc.
So Sunday ( the day of the sun) is actually less evil, more civil and more dignified than Saturday (the day of Saturn).
As you can see it is
totally foolish to talk about the pagan connections to the days of the week. The Lord's Day is the first day of week, which HAPPENS TO BE Sunday.