You don't have to be a Christian to celebrate Christmas because it is about cheering yourself up when the days are the coldest and darkest.
Jesus wasn't killed by Jews, He was killed by Roman soldiers and it was his mission to be killed and resurrected after 3 days so it doesn't matter who killed him. Jesus was a Jew himself. That is the sign of Jonah, to die for 3 days and then to be restored.
One thing I often wonder is if previous angelic encounters in the Bible were a pre-carnate Jesus, Jesus before he was born as a man. Isaac's son Jacob was wrestling with an angel because he thought it was his estranged brother that had come to kill him. Perhaps that angel was actually Jesus. I don't know.
Perhaps one of the angels that told 'Lot' to flee Sodom was Jesus, I may never know.
The question is there. Perhaps Jesus walks amoungst us and talks to us to see what we would do.