My First Wife and I always try to mail Christmas cards with a religious theme--after all, we're celebrating Christ's birthday. But we enjoy sending playful ones, too. However, we always try to get the Christmas stamps to put on the envelopes. And if there is a religious theme to them, all the better.
We're particularly impressed with this year's US Postal Service Christmas Stamp. On it, it says "Christmas" and shows a painting of our Christ child. We think that is a significant thing for our government to do this year.
Merry Christmas to you, too, Uncle Sam.