Hallwoeen is the most fun holiday of the year!
Halloween, or All Hallow's Eve, is one of my favorites but I think I prefer Christmas.
How did Christmas originate?
Well I believe it was due to Jesus' birthday. Halloween, on the other hand, was from the three0day observance of the Allhallowtide. 
Oh that sounds interesting, what is that?
It is the time in the liturgical year that is dedicated to remembering the dead.
Is that like Day of the Dead in Spanish cultures?
A little bit, except you remember people like saints, martyrs, and other faithful departed.