I still believe in Santa Claus!
I think everyone should believe in the Christmas Spirit, because there are so many good things to "carry" from the Christmas Spirit, and that's a very good point to have in your mind, when you continue your life!
Some examples from Santa Claus could be, that he is only giving gifts to others (without getting anything back) ~think about others, before yourself. And of course also all the Love, and you have to be good to "get" some good back.
Santa Claus is actually like a "God", his telling what's good and what's bad.