The celebration of "Christ-mass" began in the Catholic church melding paganism with a false form of Christianity to produce "Christmas." For many years Christians did not question where this began because they thought adding Christ's name to the pagan holiday would legitimize it for the born-again believer.
The sacrifice of the mass in Catholicism is the re-sacrificing of Christ over and over again in every mass. The idea that Christ's sacrifice on the cross was not enough, the priests had to do it every mass was developed by this paganistic religion. It violates much of scripture and is a form of cannibalism. The church teaches transubstantiation in which the emblems are no longer emblems but turn into the actual body and blood of Christ during the mass.
Since most Christians didn't know their Bibles and they knew very little about the Catholic church they accepted this pagan holiday as long as the name of Christ was attached to it. Unfortunately, it was a different Jesus than the Jesus Christ of the Bible.
Christmas began pagan, the ungodly added Christ to it and it is now returning to its pagan roots. We should not be surprised that this is happening. Holidays and festivals that were not commanded or endorsed by God, merely human ideas to worship God their own way, would eventually return to their origins.
God never blessed this holiday it was a concoction of an ungodly "religion" attempting to entice the Christians to indulge by adding a name they revered, that is the name of God.
When we know our Bibles and walk with the Holy Spirit we have no need to fit into the culture or a Christianized paganism. There is much of this going on in our society today, even those who will become angry when we say "I do not celebrate it because I am a Christian."
The choice is up to each one to determine in their own hearts if they are obeying God. My desire is for everyone to ask God about everything they do to know what pleases Him.
Amos 5:20-22 "…20 Will not the Day of the LORD be darkness and not light, even gloom with no brightness in it? 21“I hate, I despise your feasts! I cannot stand the stench of your solemn assemblies. 22 Even though you offer Me burnt offerings and grain offerings, I will not accept them; for your peace offerings of fattened cattle I will have no regard.…"