Have you ever read the Qu'ran and it mentioned which holidays are forbidden to participate in? Some Muslims say that participating in Christmas is forbidden, but these same self-righteous muslims have christmas trees and ornaments in their homes. Do you know any Muslims who particpate in Christmas?
I know some converts that join their families for celebration.
In my case, for e.g., my family has a big lunch for Christmas day. No one is religious or believes in Jesus (or God for that matter) but they just do it as a "family thing".
They know my beliefs and they know I don't believe that Jesus is god or anything like that, so I join them for the lunch and we have a great time :)
I think mostly converts, because Christmas is part of their culture, participate in different degrees in the celebrations. To be honest, we as a community have a lot more to worry about than whether some Muslims put up a tree (which has no religious significance in any case) or not.