Just to play the other side a wee bit...
Counting activities in a kindergarten class are invaluable. And when you can make them engaging and interactive, even moreso. (as are the books and learning about traditions).
You may want to be careful in how you address this, because the activities you've mentioned aren't an issue at all, I consider them *very* instructional. They're the sort of activities that schools and teachers should strive to include (counting paper, associating calendards and days to numbers, etc).
The issue becomes the 'Christmas focus" of the activities rather than the activities themselves.