It would indeed be hypocritical to practice intolerance of pagans and paganism and yet do Christmas trees and the many many other thing which Christianity has adopted from our deeply pagan heritage.
Acts 17:22 So Paul, standing in the middle of the Are-op′agus, said: “Men of Athens, I perceive that in every way you are very religious. 23 For as I passed along, and observed the objects of your worship, I found also an altar with this inscription, ‘To an unknown god.’ What therefore you worship as unknown, this I proclaim to you. 24 The God who made the world and everything in it, being Lord of heaven and earth, does not live in shrines made by man, 25 nor is he served by human hands, as though he needed anything, since he himself gives to all men life and breath and everything. 26 And he made from one every nation of men to live on all the face of the earth, having determined allotted periods and the boundaries of their habitation, 27 that they should seek God, in the hope that they might feel after him and find him. Yet he is not far from each one of us, 28 for
‘In him we live and move and have our being’;
as even some of your poets have said,
‘For we are indeed his offspring.’
29 Being then God’s offspring, we ought not to think that the Deity is like gold, or silver, or stone, a representation by the art and imagination of man.
The tradition we have from Paul is not intolerance, allergic reactions, and contamination voodoo implied by the OP. It is to see the work of God in ALL things. Therefore I think we should celebrate our pagan heritage in all the things we have brought over into Christianity. I certainly do.
What is Christmas? Jesus birthday? Well… we don’t actually know what day Jesus was born on. So we converted the greatest pagan holiday of the winter solstice called Saturnalia to Christian celebration of the birth of Christ. But Saturnalia was fascinating tradition, where slaves and their masters switch their positions and the masters would serve them dinner. It seems to me to be quite an honor to confer such a tradition upon celebration of the birth of Christ.