Not even remotely defensible.
The Roman emperor Constantine picked Sunday because it was the pagan god day of worship that the Roman citizens were used to. Nothing at all in scripture about Sunday. No “Christian” that I have ever asked has ever been able to show me where the sabbath was changed in scripture….
“Christian ” has become synonymous IMHO with dumbed down non thinking people…..
Not even sure Saturday is the Sabbath as the 7 day week was not even invented when God gave the tablets to Moses.
Something to think about..eh?