I am with Outlaw on this. But to give the benefit of the doubt for a comment-
"Son, Mommy and Daddy hate Halloween, Christmas, birthday parties. We feel just as Jehovah does about them. He will destroy those that don't agree with Him very soon. But we don't want to tell you what to do. You can do things that Mommy and Daddy and Jehovah hate while you are young and then decide for yourself what to do when you are older. OR (and it's a big OR) you can hate the same things that Mommy, Daddy, and Jehovah hate right now and you will please Jehovah, and take no chances on being destroyed."
Even if you are not nearly that straightforward, that's the kind of messages children receive.