1. There's no real difference. Father Christmas is just an older version of Santa Claus. They've kinda merged over the years. 2. I think it started from a different holiday? The Christians stole a lot of things from pagans. But you put presents under it and open them on Christmas morning. 3. They're usually not because they're considered a part of fall, but they totally can be. 4. I don't know, but they were wrong. Eggnog is gross.