Considering Christians took the Christmas celebration from what they call "Heathens" or "Pagans", I think it is fair. Eastern celebration probably the same.
Eh not really - https://historyforatheists.com/2024/12/pagan-christmas-again...
Easter also not pagan. But pophistory thinks that as well. Scholarship doesn’t line up.
There's a German term for that 'Uboot Christen' - submarine Christians. They only emerge twice a year.