Quote Originally Posted by ReDSanchous
Hello everyone!

We wish you a holy Christmas and a joyful New Year!

Love,
Oleg and Lisa.

I think you're allowed to but, as Оля has said, it's not common. You're allowed to say so because it's grammatically ok but as far as style and collocations are concerned, things are not as good as the grammar.
If you'd noticed the original had HOLY there It also isn't common to say it in English, so I assume it is as uncommon to say it in Russian here.