Doesn the Bible say that the Sabbath is Saturday?
Scripture doesn’t say that the “seventh day” was “Saturday,” and in fact Genesis and Exodus were written before the Greek and Roman Empires and thus before their calendars (and “Saturday”) existed. So, we are free to understand the Sabbath as “God’s (seventh) day” and not as a particular day on a particular calendar. (There is no calendar in the story of Genesis or in the Torah’s Ten Commandments, although the Israelites reading the story and later the Jews would have assumed their own calendar.) The point is that we are to set aside a day each week to God, not that “Saturday” is the day that God has chosen for the Sabbath.