The pagan origins thing is a myth, btw—all the various bits which people point to as evidence still date back to a Christian-era Europe and cannot be traced back further. Christianity has been around for a very very long time and has had a lot of time to evolve its own traditions. :)
For example, Christmas trees date back no later than the middle ages:
For example, Christmas trees date back no later than the middle ages:
https://youtube.com/watch?v=m41KXS-LWsY