#1. Religious Cards
The historic birth of Jesus of Nazareth is nowhere near December 25th and the celebration of Christmas was just an attempt to pander to pagans who were accustomed to having Saturnalia around that time of year. Christmas might as well be a secular holiday. And there’s no shame in that. People like getting stuff, giving stuff, and enjoying each other’s company.
Chanukah isn’t a major Jewish event, but the psychotic consumer turbine of Christmas managed to suck up this oil-miracle non-event and spit it out as an opportunity for gift-giving one-upmanship (eight days, motherfucker!). And that’s ok too! Generosity should be a secular event.
So giving someone a religious Christmas card is antagonistic and sucks a lot of the fun out of an otherwise joyful event. There’s no need to loudly proclaim your religiosity on Christmas. If you’re that type of person, chances are everyone already knows your feelings about god-stuff and they’d like one day’s reprieve.