Not religious in the slightest but here in the UK for me and many others its Happy Christmas or Merry Chistmas.. and the only time we have a Happy Holiday is when we been to Disney World or a beach in Spain
Saying Happy Holidays here, is to me like you guys walking around say Happy Vacations, ok joking a side Happy Holiday is ok here as Holiday means two things in the same word for us.
I enjoy Christmas, I like the whole Santa thing, its what the majority of the UK people celebrates, sure not everyone does but you go with majority rules. Like you will not be running around the middle east saying Merry Christmas but equally if I was running about the middle east I wouldnt be offend if they said happy whatever holiday they are celebrating, wouldnt feel the slightest bit offended as why should I. We have Muslims in our family and they sent my son a Chistmas Present that and I am looking at it now, its got Santa and Ho Ho Ho Merry Chistmas on the wrapping paper so I can safely say they not offend that we celebrate it and if they where up here this time of year we have them round for Christmas dinner and I bet they would come and enjoy it with us.
Christmas is many things to many people, call it what you like and say a friendly greeting how you like, if its done as friendly greeting then I cant see the harm in it even if the person you say it not celebrating it themselves.
Personally Christmas to me is a time to be with family, and be thankful for what you have got and to give to others. Like I said not everyone cup of tea but I can celebrate it the way I want and have it mean to me what I want and I dont need to be religious to do that.
Oh and I found this on a web site, how to say Merry Christmas around the world, now you can offend people in there own language (joking) LOL
Afrikaans: Gesëende Kersfees
Afrikander: Een Plesierige Kerfees
African/ Eritrean/ Tigrinja: Rehus-Beal-Ledeats
Albanian:Gezur Krislinjden
Arabic: Milad Majid
Argentine: Feliz Navidad
Armenian: Shenoraavor Nor Dari yev Pari Gaghand
Azeri: Tezze Iliniz Yahsi Olsun
Bahasa Malaysia: Selamat Hari Natal
Basque: Zorionak eta Urte Berri On!
Bengali: Shuvo Naba Barsha
Bohemian: Vesele Vanoce
Brazilian: Boas Festas e Feliz Ano Novo
Breton: Nedeleg laouen na bloavezh mat
Bulgarian: Tchestita Koleda; Tchestito Rojdestvo Hristovo
Catalan: Bon Nadal i un Bon Any Nou!
Chile: Feliz Navidad
Chinese: (Cantonese) Gun Tso Sun Tan'Gung Haw Sun
Chinese: (Mandarin) Kung His Hsin Nien bing Chu Shen Tan
(Catonese) Gun Tso Sun Tan'Gung Haw Sun
Choctaw: Yukpa, Nitak Hollo Chito
Columbia: Feliz Navidad y Próspero Año Nuevo
Cornish: Nadelik looan na looan blethen noweth
Corsian: Pace e salute
Crazanian: Rot Yikji Dol La Roo
Cree: Mitho Makosi Kesikansi
Croatian: Sretan Bozic
Czech: Prejeme Vam Vesele Vanoce a stastny Novy Rok
Danish: Glædelig Jul
Duri: Christmas-e- Shoma Mobarak
Dutch: Vrolijk Kerstfeest en een Gelukkig Nieuwjaar!
or Zalig Kerstfeast
English: Merry Christmas
Eskimo: (inupik) Jutdlime pivdluarit ukiortame pivdluaritlo!
Esperanto: Gajan Kristnaskon
Estonian: Ruumsaid juulup|hi
Faeroese: Gledhilig jol og eydnurikt nyggjar!
Farsi: Cristmas-e-shoma mobarak bashad
Finnish: Hyvaa joulua
Flemish: Zalig Kerstfeest en Gelukkig nieuw jaar
French: Joyeux Noel
Frisian: Noflike Krystdagen en in protte Lok en Seine yn it Nije Jier!
Galician: Bo Nada
Gaelic: Nollaig chridheil agus Bliadhna mhath ùr! German: Froehliche Weihnachten
Greek: Kala Christouyenna!
Hausa: Barka da Kirsimatikuma Barka da Sabuwar Shekara!
Hawaiian: Mele Kalikimaka
Hebrew: Mo'adim Lesimkha. Chena tova
Hindi: Shub Naya Baras
Hausa: Barka da Kirsimatikuma Barka da Sabuwar Shekara!
Hawaian: Mele Kalikimaka ame Hauoli Makahiki Hou!
Hungarian: Kellemes Karacsonyi unnepeket
Icelandic: Gledileg Jol
Indonesian: Selamat Hari Natal
Iraqi: Idah Saidan Wa Sanah Jadidah
Irish: Nollaig Shona Dhuit, or Nodlaig mhaith chugnat
Iroquois: Ojenyunyat Sungwiyadeson honungradon nagwutut. Ojenyunyat osrasay.
Italian: Buone Feste Natalizie
Japanese: Shinnen omedeto. Kurisumasu Omedeto
Jiberish: Mithag Crithagsigathmithags
Korean: Sung Tan Chuk Ha
Latin: Natale hilare et Annum Faustum!
Latvian: Prieci'gus Ziemsve'tkus un Laimi'gu Jauno Gadu!
Lausitzian:Wjesole hody a strowe nowe leto
Lettish: Priecigus Ziemassvetkus
Lithuanian: Linksmu Kaledu
Low Saxon: Heughliche Winachten un 'n moi Nijaar
Macedonian: Sreken Bozhik
Maltese: IL-Milied It-tajjeb
Manx: Nollick ghennal as blein vie noa
Maori: Meri Kirihimete
Marathi: Shub Naya Varsh
Navajo: Merry Keshmish
Norwegian: God Jul, or Gledelig Jul
Occitan: Pulit nadal e bona annado
Papiamento: Bon Pasco
Papua New Guinea: Bikpela hamamas blong dispela Krismas na Nupela yia i go long yu
Pennsylvania German: En frehlicher Grischtdaag un en hallich Nei Yaahr!
Peru: Feliz Navidad y un Venturoso Año Nuevo
Philipines: Maligayan Pasko!
Polish: Wesolych Swiat Bozego Narodzenia or Boze Narodzenie
Portuguese:Feliz Natal
Pushto: Christmas Aao Ne-way Kaal Mo Mobarak Sha
Rapa-Nui (Easter Island): Mata-Ki-Te-Rangi. Te-Pito-O-Te-Henua
Rhetian: Bellas festas da nadal e bun onn
Romanche: (sursilvan dialect): Legreivlas fiastas da Nadal e bien niev onn!
Rumanian: Sarbatori vesele
Russian: Pozdrevlyayu s prazdnikom Rozhdestva is Novim Godom
Sami: Buorrit Juovllat
Samoan: La Maunia Le Kilisimasi Ma Le Tausaga Fou
Sardinian: Bonu nadale e prosperu annu nou
Serbian: Hristos se rodi
Slovakian: Sretan Bozic or Vesele vianoce
Sami: Buorrit Juovllat
Samoan: La Maunia Le Kilisimasi Ma Le Tausaga Fou
Scots Gaelic: Nollaig chridheil huibh
Serb-Croatian: Sretam Bozic. Vesela Nova Godina
Serbian: Hristos se rodi. Singhalese: Subha nath thalak Vewa. Subha Aluth Awrudhak Vewa
Slovak: Vesele Vianoce. A stastlivy Novy Rok
Slovene: Vesele Bozicne. Screcno Novo Leto
Spanish: Feliz Navidad
Swedish: God Jul and (Och) Ett Gott Nytt År
Tagalog: Maligayamg Pasko. Masaganang Bagong Taon
Tami: Nathar Puthu Varuda Valthukkal
Trukeese: (Micronesian) Neekiriisimas annim oo iyer seefe feyiyeech!
Thai: Sawadee Pee Mai
Turkish: Noeliniz Ve Yeni Yiliniz Kutlu Olsun
Ukrainian: Srozhdestvom Kristovym
Urdu: Naya Saal Mubarak Ho
Vietnamese: Chung Mung Giang Sinh
Welsh: Nadolig Llawen
Yugoslavian: Cestitamo Bozic
Yoruba: E ku odun, e ku iye'dun!