Then how can you believe you shouldn’t steal... scribes (men) copied the Law of Sinai?
Stealing can be verified, and is certainly an obvious infraction of God's will. The strict relationship between the Sabbath and Saturday cannot be verified. There is Scripture that releases us from strict observance of the Sabboth. Any day is as good as the other. Sunday is a nice reminder of the Resurrection.
The death and resurrection of Christ freed us from the law and Jewish tradition. We keep the law as best we can out of thankfullness and love, not because it buys our salvation. Only ONE tiny infraction of the Law separates us permanently from God ... except for the Salvation through Christ by Grace alone.
A day of worship isn't really mandatory any longer; but, it does serve as an opportunity for Thanksgiving. Saturday may be the Sabbath; however, all of that nit picking is completely irrelevant.