Frohe Weihnachten und ein glückliches neues Jahr.
I would also say that to Muslims, Buddhists, Jews, Christians and atheists too, because they might just as well appreciate the name of the holiday to which they owe their days off.
And I also think it´s a good idea to be kind and wish them to be happy in the process.
On national holidays (Day of Reunified Germany, Oct. 3rd, for example, insert yours here, please) people get their days off, too, regardless of their nationalities, and nobody gives a damn if they may be insulted.
And yes, the opening sentence was meant as written.
Hans
Melton 46 S
1903 or earlier GLIER Helicon, customized Hermuth MP
2009 WILLSON 6400 RZ5, customized GEWA 52 + Wessex "Chief"
MW HoJo 2011 FA, Wessex "Chief"