I used to feel uncomfortable with the lie of Santa and really haven't told DD too much. But she has picked up some stuff from childcare so I'm happy to go along with that without making a huge song and dance. I will most likely carry on down this path until the girls start questioning it and then say "some people think ..."

I was raised Christian, have been agnostic for years and most closely identify with Buddhism. As such, I intend teaching DDs a bit about all religions prefacing it with "some people think". I'm comfortable talking to DDs about Jesus because there is enough historical evidence to show he existed (whether he was the son of God and whether there IS a God obviously is a little trickier) and I'll go down the path of, "at Christmas we celebrate the birth of a really good man called Jesus ..."