So many non-Christians celebrate Christmas though, unless you're saying that Christmas shouldn't be celebrated as a religious holiday? I'm not sure that I understand your opinion on this.
I recall as a child my uncle mentioning that soldiers brought the idea of Christmas to Japan and the Japaneses have Christmas trees, etc.
He felt that was going to bring the Japanese to Christ or Christianity.
People discuss back and forth about the intrusion of the secular into the sacred aspect of Christmas,
or the secular [commercial] becoming the sacralization of business. National holiday of material consumption.
Even with the Santa Claus myth, who is indispensable to merchants,
there is injected a sacred connection to that legend.
[We know Jesus never dressed in a Santa suit]
Using the old axiom truth that 'a tree is known by its fruit' [Matt 7v17]
has caused some to wonder about what is the holy/sacred connection or not.
Jesus taught [John 4vs23,24] that true worshipers would worship God in truth.
Jesus believed the Scriptures are religious truth or fact. [John 17v17]
Meaning religious myth or legend would Not be connected to biblical truth.
Mixing of biblical truth with pagan [non-biblical] has caused the original to shed it's old or Scriptural account into new man-made traditions or customs.
[Mark 7vs1-7,13;Matthew 15v9]
God's own people of Ezekiel [8v16] were in God's temple, but they were actually in there worshiping the sun. Such mixing or blending of worship was Not based on religious truth of Scripture, so God's favor or blessing was removed from them.
So, according to Scripture, how would God view today's religious sycretism [mixing or fusion of differing belief] including the secular being blended with the sacred ?