Some forty years after their founder and leader had taken the lift to paradise, an old boy who'd known him named Luke embarked upon a literary enterprise that would serve for many churches and a couple of centuries as the recruiting pamphlet for those who hadn't been around to witness the original run of the production.

Two hundred or so years later, someone in a red hat decided that it would be a good idea to not only celebrate the earthly death and subsequent corporeal recycling of the boss, but to stir up a little excitement about his birth and the events preceding and surrounding it. Luke's little pamphlet provided a bit of the necessary grist for the holiday mill, but a little bit of punching up was needed if it was to compete successfully with the other faith's celebrations. So a little bit of cutting and pasting using bits and pieces of other traditions brought to a useful and foaming head the famous twelve days plus Boxing day that we could almost unrecognize today.

The early Christians had no use for a Christ Mass celebration or tradition. They were really really looking hard for the coded message in the Gospels plus the supposed book of Revelations that would tell them exactly when the Boss would come striding back into the office.
He'd promised a return engagement that would signal the beginning of the end of the world and the end of the beginning of a new Kingdom of Heaven, at least the way they read it. Or heard it.

It was the Church as a corporation that needed to get on with business as usual, so they declared that old what's his face wasn't really needed on the ground since they knew what he wanted to be done and they were part of the succession of people who had touched people who had touched people who had been touched by Jeshua Von Nazareth, so they were pretty much just as good as the real thing, so take their word for it. The Kingdom Of Heaven was going to happen real soon, and the end of the world as you know it meant that you were going to gain a religion real soon or pay the price for not being part of the club.

The Gospels themselves show no moments when Jeshua dwells upon his conception or birth or the Slaughter of the Innocents under Herod while his folks took a vacation in Egypt. In fact, if one reads the text and the subtext with a straight face and a sober mind, he takes great pains to make sure that he and his mum would not be revered, sanctified and worshipped. He had a little problem with litanies and ceremonies. He also had a problem with tradition.

I don't think, looking down from the right hand of G-d, that he had much problem with the Bishop of Nicea when he was a functioning individual. It was only when Nicholas became a Saint that it gets a little hinky. I mean, Jeshua only used the word "saint" to describe people who were living.