The Sabbath is the Sabbath, from the seventh day of creation until time is no more. That is what Jesus Christ said, so I have no choice but to agree with it, nut cases not withstanding.
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Mat 5:
17 ¶ Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil.
18 For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled.
19 Whosoever therefore shall break one of these least commandments, and shall teach men so, he shall be called the least in the kingdom of heaven: but whosoever shall do and teach [them], the same shall be called great in the kingdom of heaven.
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Do you argue with those words?
Are you some kind of Adventist? You forget that we are now living in the New Covenant and we Christians are now God’s chosen people. The Holy day is on Sunday for us. Your adventists think this is some kind of mark, but that is a wrong belief