Read on, there is at least one other freeper who agrees that Sunday is the Christian Sabbath--even if what you posted holds, there still is one day set apart from the others in the week (hence the traditional day off on Sunday--and later Saturday). Furthermore, there are at least two additional others who have heard of Sunday being referred to as the Christian Sabbath.
With all due respect, I don't care if a hundred Freepers came on here to say that Sunday was the Sabbath. Scripture tells me that the "Sabbath" is Jesus Christ, and we find our rest in Him (Heb. 4), not in a day. In fact, Col. 2:16 says, "Therefore, let no one act as your judge in regard to food or drink, or in regard to a festival or a new moon [Old Testament observances], or to a Sabbath day -- things that are a mere shadow of what is to come. But the substance belongs to Christ." The argument about which day is the Sabbath reveals an ignorance about the fact that Christ is our Sabbath rest, and this argument falls into the worst kind of mistake that dominates in much of Christianity -- i.e., placing people back under the law of the Old Testament rather than under the grace found in Christ.