To speak my peace briefly, Christmas is not warranted by the Word of God with respect to public worship, or with respect to any other sphere of worship (family or private), because it involves celebrating the birth of Christ which is a worshipful act whether done on the religious level or the so-called secular level, but lacks the positive command of God to do so.
The date of Christ's birth is hidden from us (much like the body of Moses) and that fact alone, not to mention that there are two dates on the calendar most frequently observed in the world today (December 25 and January 6), most in our society choose to align themselves with the Papal calendar rather than the Orthodox calendar, ought to restrain us from following in this idolatry.
Anyone who claims to adhere to the regulative principle of worship ought to refrain from Christmas-keeping, which is a blatant violation of the second commandment. The birth of Christ is something to be studied, meditated upon and to rejoice in, but it is not to be observed as a holiday of our own devices. God has given us 52 weekly holy days per year to observe. Christmas is will worship and derogates from the true holy day, which commemorates the Lord's resurrection.
It is my prayer that the saints will prayerfully consider these things, and abstain not only from the excesses (gluttony and greed) that mark the day in our society, and not only from the intrusion of the ecclesiastical calendar, trees, wreaths, candles and other Popish and pagan inventions in public worship, but also the private setting apart of a day to mark Christ's birth (an act which is -- or should be -- worshipful and hence regulated by the second commandment even if done in a secular, "Christless" way). The error of putting Christ into the season is not corrected by taking him out and still celebrating it. Jesus is not the reason for the season, and it is an offense to his name to observe the holiday in any way. I encourage all to mark it the way the Puritans and Pilgrims did -- as a day like any other. This is to the glory of God.
I say these things, passionately and seriously, with humility and not self-righteousness, and with the greatest of respect for my godly brethren who differ, but with the earnest desire to see God's people not fall into the ways of the heathen, but to worship God only as he has commanded.
BTW, Josh -- I still have a bottle of Calvinus and I've been waiting for the right time and the right person to imbibe with. If you are ever this way...
