What you have proven is that you judge people of the Sabbath against Col 2; you demonstrated that you don't want to acknowledge that you are imposing your faith on others and not realizing that Romans 14 does deal with the Sabbath; you acknowledge there is no 8th day but don't want to content for the eternal rest of Heb 4 and that Jesus is the Lord of the Sabbath and those who are in him have found their rest.
In the Apostles time, you would be labeled the one who is imposing a law, like unto circumcision, on those who aren't required.
It is quite transparent as there are many who have pointed that out.
Your referral to Col 2 and Romans 14 is a referral to the "tare" seed (false gospel of grace) planted by the "enemy"/"devil) among the wheat seed, the message of the "son of man", in the same "field"/NT (Matthew 13:24-42). Just look to Romans 7:18-25 as to regards of the character of that actor, and the demons which power his "little" (Paul) motor. And there is an 8th day, with regard to Leviticus 23:39, which follows the feast of Booths, which all Gentiles will be required to keep during the millennium (Zechariah 14:16-17), and the 8th day would represent the white throne judgment, whereas the righteous live, and those not written in the book of life, face the lake of fire, and receive their rest from the turmoil of their despair for eternity.