A while back, Steadfast Lutherans started a series by Pastor Joseph Abrahamson about all the pagan lies that circulate to try and claim Christians are compromising by following a church calendar or having Christmas trees and the like. So here are what they have so far, and I'll add links as they add to this series.
Steadfast Lutherans' tag for 'Redeeming the Holy Days from Pagan Lies'
articles so far (in reverse order of publication I think):
Redeeming Holy Days from Pagan Lies-Easter 2
Redeeming Holy Days from Pagan Lies-Easter 1
Redeeming Holy Days from Pagan Lies — Valentine’s Day
Redeeming Holy Days from Pagan Lies — Ash Wednesday and Lent
Redeeming Holy Days from Pagan Lies — Pagan Solstice Celebrations 2
Redeeming Holy Days from Pagan Lies — Pagan Solstice Celebrations (1)
Redeeming Holy Days from Pagan Lies — Christmas and Sol Invictus
Redeeming Holy Days from Pagan Lies — Christmas
One person esteems one day as better than another, while another esteems all days alike. Each one should be fully convinced in his own mind. The one who observes the day, observes it in honor of the Lord. The one who eats, eats in honor of the Lord, since he gives thanks to God, while the one who abstains, abstains in honor of the Lord and gives thanks to God. For none of us lives to himself, and none of us dies to himself. For if we live, we live to the Lord, and if we die, we die to the Lord. So then, whether we live or whether we die, we are the Lord's. For to this end Christ died and lived again, that he might be Lord both of the dead and of the living.
Why do you pass judgment on your brother? Or you, why do you despise your brother? For we will all stand before the judgment seat of God; for it is written,
“As I live, says the Lord, every knee shall bow to me,
and every tongue shall confess to God.”
So then each of us will give an account of himself to God." Romans 14:5-12
Therefore let no one pass judgment on you in questions of food and drink, or with regard to a festival or a new moon or a Sabbath. These are a shadow of the things to come, but the substance belongs to Christ. Let no one disqualify you, insisting on asceticism and worship of angels, going on in detail about visions, puffed up without reason by his sensuous mind, and not holding fast to the Head, from whom the whole body, nourished and knit together through its joints and ligaments, grows with a growth that is from God.
If with Christ you died to the elemental spirits of the world, why, as if you were still alive in the world, do you submit to regulations— “Do not handle, Do not taste, Do not touch” (referring to things that all perish as they are used)—according to human precepts and teachings? These have indeed an appearance of wisdom in promoting self-made religion and asceticism and severity to the body, but they are of no value in stopping the indulgence of the flesh." Col 2:16-22