the old pagan ways were to bring in a tree from the forest and care for it during the winter months... so that the forest spirits would bless you...

after some time... people began decorating said tree... it stayed in their house for months... why not spiff it up?

Then when Christianity became popular in the areas who had that practice... they had done it for so long... so why not continue bringing in a tree in the winter? It was pretty and tradition.

Thats the how the Christmas Tree got its start...

We still to this day continue on this ancient tradition.