I personally don’t have a problem if a fellow Christian does not wish to celebrate Christmas because of personal convictions that they may have. That obviously is their choice and scripture indicates to me that they do have that option.
The following Scripture verses come to mind:
Romans 14:1-7 NIV “Accept the one whose faith is weak, without quarreling over disputable matters. One person’s faith allows them to eat anything, but another, whose faith is weak, eats only vegetables. The one who eats everything must not treat with contempt the one who does not, and the one who does not eat everything must not judge the one who does, for God has accepted them. Who are you to judge someone else’s servant? To their own master, servants stand or fall. And they will stand, for the Lord is able to make them stand. One person considers one day more sacred than another; another considers every day alike. Each of them should be fully convinced in their own mind. Whoever regards one day as special does so to the Lord. Whoever eats meat does so to the Lord, for they give thanks to God; and whoever abstains does so to the Lord and gives thanks to God. For none of us lives for ourselves alone, and none of us dies for ourselves alone.” Bold emphasis is mine.
Yet every year around this time, one can see some posts that appear on various social media venues by fellow Christians, that infer, that because they have chosen not to celebrate Christmas, for reasons which they have determined are valid, we fellow Christians who have decided to celebrate Christmas, should not.
The reasons given for not celebrating Christmas are not new and have been looked at from multiple angles by many devout Christians for many years, but it is not difficult to ascertain how different conclusions can or may be reached. I’m thinking that this particular decision about celebrating Christmas would definitely qualify as a “disputable matter”, and as such, some exercised flexibility should be forthcoming by all concerned brothers and sisters in the Lord. The verse from Romans above that states “Each of them should be fully convinced in their own mind.” would seem to me to definitely be applicable.
The links provided below identify the vast majority of the arguments given for not celebrating Christmas plus corresponding supplementary information that provides a differing perspective. Hopefully you will find them helpful.
no-christmas-is-not-based-on-pagan (multiple references)
is-christmas-pagan (multiple links)
christmas-is-not-pagan-once-again/ (multiple links)
Worthy is the Lamb! Blessings!