“Yeshua cannot have changed the Sabbath day and be sinless”
But why do you believe Saturday is the day?
There are records among the Jews to defend their 7th day as the Sabbath - And as the day that Yeshua recognized (having made no correction), and the day that HE attended Synagogue, I have naught to do but follow him.
Virtually everyone knows WHEN the Sabbath is, even though they don't keep it.