"Merry Christmas, mate!" English is the predominant language in Australia, so you say it in exactly the same way except with the addition of an Australian accent. Or: Usually you just say "Merry Christmas" or "Happy Christmas". In the vernacular, you might say, " 'Ave a good one, mate."
Just as in your question !They tend to say "Happy Christmas" instead of "Merry".Merry Christmas
You say ' Merry Christmas' in the UK.
merry christmas
"Merry Christmas"
Merry christmas
merry christmas
Merry Christmas
merry Christmas= Christmas aashamsakal
Hanukkah is a holiday, not a language. You cannot say "Merry Christmas in Hanukkah. That's like asking: "How do you say Merry Christmas in Easter" I think he means how do you say merry Christmas in Hebrew
Merry Christmas
Merry Christmas