Merry Christmas, RA! I would suggest just focus on the Biblical Christmas events and share them for evangelism with those who do not know, like non-Christians, or discuss them for edification with those who do know, like other Christians. You know, (1) Christ's Birth in Bethlehem, in a Manger, (2) How this was David's City, and fulfilled Prophecy (3) How He was truly God made Man and worshipped as such by the Magi right from His Birth (4) How the Angels sang Glory to God at His Birth (5) How the Shepherds came and Glorified God. For myself, I cannot understand, with so much Biblical Focus on Christ's Birth, and it's clear importance - He who was not born in Bethlehem cannot be the Messiah - why some say we should not celebrate Christ's Birth.
If you want to celebrate on another day, then first of all (1) calculate that date of birth and give Scriptural evidence (2) give historical evidence as to how early this celebration of yours began. If it began now in 2022, or later, it's not historical.
Even the detractors of Christmas admit it was certainly celebrated no later than 336 A.D. And there are 2nd century testimonies to it. And the possibility that Zechariah was ministering on Yom Kippur, would fit with a late Sept. Conception of John the Baptist, a late March Conception of Christ, and thus a late December Birth. The possibility that Christ the Light of the World is the Fulfilment of Hannukah, which is on Kislev (roughly December) 25 also beautifully corresponds to it.
Finally, what happened in one particular church is not evidence of any universal phenomenon. So many (1) believe in or renew their Faith in the Love of God, Who became Man in Christ and was born for us as a Baby in a Manger, and (2) give gifts of charity to their poor neighbors, thus fulfilling the law of Christ, to love one's neighbor as oneself, at this time.
There are many customs linked to this Season. Some of them are directly Biblical, others of them are secular but harmless. Some of them are commercializations but those aren't the true Spirit of the Season. The true Spirit is first of all recognizing the Love of God in Jesus Christ that led God to become Man. Then, it is loving our neighbor as He loved us.
Rom 13:10 Love does no harm to a neighbor. Therefore love is the fulfillment of the law.
In Christ,
Xavier.