I think it would be a good idea to send the folks at the ACLU a Christmas Card. No nasty messages. No snide remarks. Just a pleasant reminder to enjoy the season. A nice, CHRISTIAN Christmas card. If you are so inclined, here is the address...
125 Broad Street
New York, NY 10004
Put your name on it, but I wouldn't put a return address or any other identifying information, unless you want to be solicited for donations.