Should We (Christians) Care?

I was listening to Christian radio and they were discussing how different the Christmas season was now as opposed to say 30 years ago.

As I listened I began to think, is it something we Christians should be concerned about?

So my question to you is: Should we, as Christians, be concerned with how the world celebrates Christmas (even Easter) and why?

Not only give your personal opinion, but also provide scripture to back up your point of view?