"What this means is that the birth narratives were added in as an afterthought or in reaction to some perceived need or desire brought about by some external conflict or issue. This leads to confirmation that the birth narratives are not historically reliable."
The Bible has no primary sources, thus, it is not historically trustworthy. Add in the probability that the Jesus infancy narratives were added late in the story and one has even less reason to accept the Bible as anything other than historical fiction. In any event, please enjoy Christmas if you celebrate it in any way.
Luke 1 & 2 Infancy Narratives as a Later Interpolation