the timing of Christmas and the cultural traditions involved are irrelevant - they're just fun things
Fun, sure, but something they would have stoned you for in the times of the old testament. Sun worship and shit like that wasn't tolerated.
But Christianity is convenient religion like that nowadays because anything goes. Literally anything. There are even Christian priests who are atheists.

Christianity is whatever you want it to be. That's why I think Sherief is right, Christianity is weak as far as true believers. That's why Islam is such a thread to the West. Here in Sweden I'd say Islam is a bigger religion than Christianity already - it's
stronger.