The only thing one need know about Christianity is that Christ probably never existed. The Story of Judas was plagiarised from the Old Testament story of Joseph being sold for twenty pieces of silver; the journey to Bethlehem was conjured up out of necessity in order to fulfill the Messianic prophecy; Genesis was a plagiarisation of a Sumerian creation story; the Flood was plagiarised from the Babylonian story of the Epic of Gilgamesh; the story of Exodus is a misinterpretation resting on a mistranslation of a Hebrew word which means 'reeds' and not 'red' - Moses never went out of his way to lead his people - all 600,000 of them - for 40 years (yeah, right) through the desert to cross the Red Sea (they crossed the Reed Sea - a small, shallow bog - in the north of Egypt; the story of Jesus is a plagiarisation of such stories as Horus and Mythra; Jesus wasn't born on December 25th, and no historical accounts of the Biblical Jesus exist. Where's your 'faith' now? Still got it? Thought you would.
Adendum (made at 9.43 - several hours after post):
I concluded with 'Thought you would' because no matter what the contradictory evidence, people of faith will always go on believing certain things through ignorance. Caesar Augustus never issued a decree for people in the Holy land to register for tax purposes in an empire-wide census. There is no record in Roman record-keeping of it; and Roman record-keeping was very thorough. However, a decree was issued by Quirinius dating from 6AD onwards - if a mix-up is the case, then Luke's gospel is to be treated as meaningless. If Jesus was born, he was born in Nazareth - and certainly not on December 25th (as I've said, countless times, that's a date made purposefully - it's the date of the winter solstice (although it would have been December 21st before the Gregorian Calender was made standard in the Christian world)).