Why do we blow out candles on birthday cakes? The answer involves Egyptian theocracy, the moon goddess, and (as for many holidays) the mixing of Christian and pagan tradition.
Why does a rabbit leave colored eggs, candy, and nonedible novelties for children on Easter morning? The answer involves little ones leaving out an item of clothing overnight with the expectation that it will be filled with gifts, families providing a favorite snack for the mythical bringer of presents, and naughty children receiving a lump of coal . . . sounds familiar.
Why do we cut down evergreen trees and decorate them with glittering ornaments and lights during the Christmas season? The answer involves the sun god, the Garden of Eden, and Charlie Brown.