If you receive or send only one card with any definite religious word or picture, then you are practising a Christmas celebration;
If someone sends me a card with religious imagery, that's on them. If I send one with religious imagery... well, it'd be by accident, I don't choose them for that. It might be mocking religious iconography (three wise men with their camels on bricks, for instance) but I suspect you'd not considered that 'religious observance'.
or if you participate in any way, however small, you being hypocritical.
Participate in what? Midwinter celebrations? The fact that they are called 'Christmas' in most of the English speaking world doesn't give Christianity ownership of them.
The atheists on here denigrate religion, often in the most base manner, yet are prepared to join in the Festival which celebrates the birth of Jesus.
Just like the Christians historically denigrated the pagans, but stole their midwinter festival and pretended the avatar of their god emerged then.
In my book that is gross hypocrisy. What more can I say? I am repeating myself; yet still the they argue. What a bunch of fakes!
In that case I suggest you get a better book, but then that's always been the case.
O.