Here's a good video concerning the evangelical response of those who claim that Jeremiah 10 refers to Christmas trees.
This youtube channel, InspiringPhilosophy, is creating a set of videos debunking the claim, commonly made by Armstrongites and Hebrew Roots Movement types, that Christians are neo-pagans. Usually, they are making this assertion to build up their own faulty world views.
Enjoy, and also check back for InspiringPhilosophy's addition to this anti-holiday series.
I used to be an ignorant Armstrongite that believed these sorts of things:
https://www.youtube.com/watch?v=ca_Yx3aMCiE
Most of this stuff comes from Alexander Hislop's Two Babylons and the writings of Jacob Grimm.