VIDEOS:
The Tuatha De Danann
As Red explains, in her analysis video on The Book of Invasions, the Celtic Tuatha De Danann were heavily censored and edited, to better fit to the Christian views of the then current Irish people. Instead of gods, they were turned into sorcerers and demons, with some very questionable Christian elements thrown in as well.
Example of:
Bowdlerise
Example of:
Hijacked by Jesus