Perhaps it is the outside looking in perspective, but it’s hard as a non-Christian to understand why such traditions as the Easter bunny hiding chocolate, a fat guy living on the north pole, and a day devoted to ghosts and witches (Halloween) became so widely popular, especially in a puritanical protestant nation, such as America.
The basic answer is that these Holidays are not pagan, in date, origin or practice and a lot of the supposed ancient pagan traditions are surprisingly modern additions. For Christmas see this excellent answer by u/KiwiHellenist for Halloween you can check out this answer by u/circuitloss and for further reading check out these comprehensive articles about Christmas and Halloween by u/TimONeill featuring an indepth analysis of primary sources.