Atheists have as much rights as anyone to believe what they want.  There is no reason for us to stop having christmas parties and trees in schools or public places though!  We have the right to enjoy the holidays our way.  Trying to ruin someone elses party by banning things or stopping others is going about things the wrong way. 

Going overboard in political correctness is a big problem.  There are huge differences even between people in the same religion.  Atheists will have to explain to the kids what christmas means.  A lot of people enjoy christmas as a holiday and not just a religous event.

MJ