VIDEOS:
The Book of Invasions
Red from Overly Sarcastic Productions, talks about how due to interference and censorship by Christianity, a lot of the original context and origins of the Celtic and other mythologies have been vastly altered and changed to suit the needs of the Church. In particular the Tuatha Dé Dannan and other deities were changed into kings, fairies and demons.
Example of:
Hijacked by Jesus