I personally do not worry about nor does it matter to me, what type of 'Christmas' card a family or friend sends me.
It can be religious or not or just plain ol' generic 'happy holidays' type thing.
It is just them and their expression of it.
So what I receive from people/friends/family is fine.
I don't over think it. I don't worry about sending out a different card to each different type of person.
I just choose one that floats my boat, and our family.
Then, some people do NOT even send out Christmas or holiday or New Year's cards. Fine. No biggie.
It is also a budget thing too.
I know many people who don't send cards. Period.
And that's fine too.
Then, if you really know those people who you are sending a card to, and think they will be offended or fussy about it and what "type" you mail them, well, they are not being gracious. I mean, a card is a card.
Or just get 2 types of cards, if you feel your non-Christian and Christian friends will only.... want.... a.... certain.... type.
Personally, whatever type of card a friend or family sends me or us, well so be it.
I ain't gonna create an issue of it.
I mean, its just a card. They are thinking of us. Great!
Then, what about a person's culture? Not only their religion?
I mean, it gets just wayyyyyyyyyyyyy to complicated.