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Jesus himself said He did not come to abrogate the Law, which is the moral law, we more commonly know as the Ten Commandments

The Saturday Sabbath is not part of the moral Law. It's ceremonial, and was prescribed only for the Jews. (In fact, according to Jewish halacha, Gentiles are not supposed to observe the Sabbath.)

Please note that the moral law is binding on everyone, and could be perfectly comprehended by unfallen human nature entirely apart from divine revelation. Unfallen human nature could certainly conclude the existence of God, could conclude that he ought to be worshipped, and could even (perhaps) conclude that time ought to be sanctified by some regular schedule of worship ... say, perhaps, every seven days.

But there's no way to get to a Saturday worship requirement, as opposed to say a Tuesday worship requirement, apart from divine revelation. The Saturday sabbath is part of the ceremonial law, certainly not binding on Gentile Christians.