A great source on Christian mythology (read bullshit) can be found at the well researched site Jesus Never Existed (jesusneverexisted.com). I found the whole issue of Jesus’ alleged birth to be particularly interesting.
And in the sixth month the angel Gabriel was sent from God unto a CITY of Galilee, named Nazareth, to a virgin espoused to a man whose name was Joseph, of the house of David; and the virgin’s name was Mary.
And all went to be taxed, every one into his own city. And Joseph also went up from Galilee, out of the CITY of Nazareth, into Judaea, unto the city of David, which is called Bethlehem; because he was of the house and lineage of David:
The story is nonsense on several levels, first of all no city of Nazareth existed until well into the 2nd century CE. Next is the fact that Galilee was not a Roman province and would have no reason to respond to a Roman census. And finally, there is no record of Augustus or any emperor conducting a census (the Romans taxed property not individuals). So except for those minor issues the story seems acceptable to the deluded.
The author of the site (and book of the same name), Kenneth Humphreys, takes a large axe to St. John the Lunatic’s Revelation. It appears the early Christian writers weren’t just liars and loons but also notorious plagiarist of even older religious bullshit.