Colossians 2:8,20-23. The emphasis of the great apostle throughout this chapter is on forsaking the traditions and commandments of men, and rather clinging to Christ and His commandments, for "in Him are hidden all the treasures of wisdom and knowledge . . in Him dwells all the fullness of the Godhead bodily and you are complete in Him, who is the head of all principality and power" (Col 2:3,9-10). Dear ones, you are not complete in yourself or in any man-made ceremonies in worship. You are complete, made full and acceptable through His work on your behalf. He is the head of the church, not you or me. He is our Prophet, Priest, and King. He alone directs our worship and presents it acceptable to the Father. Paul infers that to practice any "will-worship" (or "self-imposed religion" Col. 2:23) "according to the commandments and doctrines of men" (Col. 2:22) is to undermine the finished work of Christ (Col. 2:11-23) and to seek to usurp the headship over the church that rightly belongs to Christ (Col. 2:8-10,18-19). Self-imposed worship (i.e. any religious act, gesture, symbol, or ceremony in worship) is expressly condemned by Christ and His apostles. It is in fact false worship which no Christian should tolerate in the house of God without a verbal protest to the leadership and separation from this false worship until there is biblical reformation in worship ("The sins forbidden in the second commandment are, all devising, counselling, commanding, using, and any wise approving, any religious worship not instituted by God himself" (The Larger Catechism, Question 109). - Greg Price, Foundation for Reformation: The Regulative Principle of Worship, emphases added, free online book.
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Of holidays and holy days and days of fasting...

"Q. May the church appoint holy days, to remember Christ’s birth, death, temptation, ascension, &c.?

A. No; as God hath abolished the Jewish holy days of his own appointment, so he hath given no warrant to the church to appoint any: but hath commanded us to labour six days, except when Providence calls us to humiliation or thanksgiving; and expressly forbids us to observe holy days of men’s appointment, Col. 2:16; Gal. 4:10,11.

Q. What is the difference between a fast day and a holy day?

A. The day of a fast is changeable, and esteemed no better in itself than another day; but a holy day is fixed to a certain time of the week, year, or moon, and reckoned better in itself."

- John Brown, of Haddington, Associate Presbyterian, An Essay Towards an Easy, Plain, Practical, and Extensive Explication of the Assembly’s Shorter Catechism (1758), https://www.facebook.com/groups/covenanter.org/
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CHRISTMAS 1. In the pure Apostolical times there was no Christ-mass-day observed in the Church of God. We ought to keep to the primitive Pattern. That Book of Scripture which is called, The Acts of the Apostles, saith nothing of their keeping Christ’s Nativity as an Holy-day. The [Cent. 2.] Centuriators, and many others take notice that in the first Ages of the New-Testament Church, there were no stated Anniversary Holy-days among Christians. Easter was kept a long time before the Feast of the Nativity, and yet the Apostles never ordained that, as [Lib. 5. c. cap. 22.] Socrates (the most excellent of the Ancient Ecclesiastical Historians) does truly observe. Had there been the least hint of any such day observed in the primitive times, learned Vossius would have told the world of it. One [Voetius in Disput. de Nativ. Christi. p. 22.] saith of him, Si pergama dextra defendi possunt etiam hac defensa fuissent. But he acknowledges that the Feast of Christ’s Nativity was not kept in the first nor yet in the second Century. After Prelatical writers have said all they can say, Chemnitius [Contra Conc. Trial. part. 4 de Festis. p. 262.] his words will be found true. Anniversarium diem Natalis Christi celebratum fuisse, apud vetustissimos nunquam legitur. The most Ancient writers speak not the least word concerning the celebration of Christ’s Birth-day.

2. The word Christ-mass is enough to cause such as are studious of reformation to dislike what shall be known by a name so superstitious. Why should Protestants own any thing which has the name of Mass in it? How unsuitable is it to join Christ and Mass together? i.e., Christ and Antichrist. But what Communion has light with Darkness, and what concord hath Christ with Belial? 2 Cor. 6:15. some of the Jesuits [So the Rhemists.] have advised that endeavours should be used to keep up their old terms and names, such as Priest, Altar, Christ-mass, Candlemass, and the like, hoping that by means thereof in time the things would follow the Names whereby their memory is preserved.

- Increase Mather's Testimony Against that Prophane and Superstitious Custom of Christ-mass Keeping

Excerpt:

"In the Apostolical Times the Feast of the Nativity was not observed. The very name of Christmass savours of superstition. It can never bee proved that Christ was born on December 25. It is most probable that the Nativity was in September. The New-Testament allows of no stated Holy-day but the Lords-day. Objections answered. It was in compliance with the Pagan Saturnalia that Christ-mass Holy-days were first invented. The manner of Christ-mass-keeping, as generally observed, is highly dishonourable to the Name of Christ."
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