it is a well known fact that pagan customs and religious customs have been combined for centuries. a tree has nothing to do with Christ. the evergreen is a symbol for life during the winter months. i think jerimiah 31 (have to look it up) says something about people cutting down trees and setting them up. people used to worship nature and natural things as gods. nowdays, people are just oblivious as to what they mean.
Santa is just a way to brainwash children and get them used to the idea of the Christian moral system.