wishing any holiday (religious, public, private or whatever) is totally fine. because even if you don't celebrate that particular holiday, you can join your friends who celebrate it and you can celebrate it with them. just like it might not be your birthday but you do celebrate your friend's birthday with your group of friends. so celebration itself is a wonderful idea. however, there is another thread here that ask people what is their religion....whoever started that thread must not have been taught by their parents that you don't talk about religion outside your own family...so talking about religion and defending it in a public forum is a stupid idea and is a waste of everyone's time....it will accomplish nothing worthy!