Yes, of course. Same way everyone else did: tree, decorations, presents, good food. Christianity has absolutely nothing to do with christmas.
When i was very little, i think i figured out it was my parents all along when i was no older than five or so.
Yup, same way as i did as a kid. Still don’t understand what not being christian has to do with it.
About what? Santa? i guess i’d play along with the whole Santa thing if it made them happy.