Christmas, cutting and decorating trees, etc. is a man-made tradition (heathen)
God does not approve of it

 
Jeremiah 10:1-11:

1. Hear ye the word which the LORD speaketh unto you, O house of Israel:

2. Thus saith the LORD, Learn not the way of the heathen, and be not dismayed at the signs of heaven; for the heathen are dismayed at them.

3. For the customs of the people are vain: for one cutteth a tree out of the forest, the work of the hands of the workman, with the axe.

4. They deck it with silver and with gold; they fasten it with nails and with hammers, that it move not.

5. They are upright as the palm tree, but speak not: they must needs be borne, because they cannot go. Be not afraid of them; for they cannot do evil, neither also is it in them to do good.

6. Forasmuch as there is none like unto thee, O LORD; thou art great, and thy name is great in might.

7. Who would not fear thee, O King of nations? for to thee doth it appertain: forasmuch as among all the wise men of the nations, and in all their kingdoms, there is none like unto thee.

8. But they are altogether brutish and foolish: the stock is a doctrine of vanities.

9. Silver spread into plates is brought from Tarshish, and gold from Uphaz, the work of the workman, and of the hands of the founder: blue and purple is their clothing: they are all the work of cunning men.

10. But the LORD is the true God, he is the living God, and an everlasting king: at his wrath the earth shall tremble, and the nations shall not be able to abide his indignation.

11. Thus shall ye say unto them, The gods that have not made the heavens and the earth, even they shall perish from the earth, and from under these heavens.

(KJV)