Santa Clause in particular is entirely an American tradition. It's just a shame that little kids are getting jerked around by adults looking for something to be offended by... Why not think about the kido's? I don't care what religion you practice, kidos know about Santa and I really don't think most of them equate it to a religion :/ I certainly don't, and I'm an agnostic adult. Santa is about kidos to me, nothing more, nothing less.
Santa is celebrated by kids around the whole world.