I am so sorry. I remember the dad leaving--when I was a kid, but never on christmas.
.N.O it is not your fault--even if you were the worst kid on the planet--it is never the kids fault. If he still loved your mom--no matter what you do it would not change that. Some pple just fall out of love. And some just find someone else they love more. And they dint know what they had wasnt the best until they find the new person. Or some pple just get too angry to let it go, and close their hearts up and the love they felt for the person--is locked up in there too.
I dont know why he dint think of kissing you or holding you before he left, but I am sure he thought about it afterwards. And must regret his lack of compassion towards his own child.
Hang in there honey, try to hit base with some kids from the church--they will be able to offer some encouragement for you. You also need to find a good christian counselor. And remember .God loves you, and I do too.
Always
joanna