I'd like to bring up some historical writings to this discussion in light of several inaccuracies that have been presented, as well as several things which have been left out. Before I begin, for those who don't know me (I haven't posted in several months) I do not celebrate Christmas nor do I believe it was his birthday. My intention is NOT to defend my position: it is to introduce some further writings and things to consider.
The first concerns Hyppolytus of Rome. It is not in dispute that he claimed the birthdate of Jesus as December 25th. He did so around 205 AD. What may not be realized is that he wasn't the first to make a claim. Approximately in the year 195 AD Cement of Alexandria noted several other possible dates. He leans to November 18th, but notes sevaral believed it to be sometime in in the spring ranging from March to May. None of the dates suggested are December 25th, although some believe the November 18th date with calendar adjustments fits January 6th. The original writings can be found in Stromata 1:21. However, an easier read is "How December 25th Became Christmas" at the Biclical Archeology website.
My point is that there were many dates suggested in this time period. In my opinion, none of them have strong historical backing. Some dont have reasons given while others come from a very questionable interpretation of Daniel. Hyppolytus didn't have an "Eureka!" Moment... He was just one of many proposing a date.
The second has to do with Saturnia. It has been suggested that it wasn't an official holiday until 274 AD. It was also suggested that 274 AD was the "inauguration" date. The latter depends on how you use the word. However, it should NOT be mistaken to believe that was the first one, because it wasn't: far from it! A Roman historian named Titus Livius (also know as Livy) is claimed to have said it dates back to the 5th century BC, with some believing it was older. Livy (who lived 59 BC to 17AD) notes that Augustus and other authorities set regulations on the holiday.
Saturnalia
The point is that its incorrect to somehow state or imply that Saturnia started after Hyppolytis claimed December 25th as Jesus's birthday. The festival was already in full swing and had been for centuies.
The last has to do with the Course of Abia. No one has called it that, but a few have referenced it as the account from Luke 1. There is A LOT of backstory to this. I don't have a website or reference to give. You have to do a lot of Bible searching and googling calendar adjustments to figure it out. I spent 2 solid months on it and found it impossible to pinpoint a date. But let me try to make it quick:
It has to do with Zacharias and his wife Elizabeth (parents to John the Bapist). Zacharias was a priest of the course of Abia. As such he was assigned to 4 temple services throughout the year, and possibly a 5th if it was a "leap year". Each course had a different set of dates: 2 dates a year plus 2 more on certain holidays. Thats four dates, but subtract one because in the spring, the course of Abia was followed by a holiday. This gives 3 dates Zacharias could've been in the temple. A possible 4th if it was a leap year, but I found no evidence for that being the case.
So, from there we figure Zacharias finished his duty and went home and communicated this somehow to his wife (he was mute). Thus, 9 months after that John was born and 3 months after John, Jesus was born.
Through my research I found that 3 dates "could,ve" been Jesus's birthdate: one in the Spring around March, one around September and the last sometime around January 6-9. Note that with calendar adjustments that the January date coincides with an approximate Dec 25th date.
The first peoblem is that people who use the Course of Abia to tout their claim ignore the fact that there were 3 possibilities. Many eliminate the holiday date claiming it was not part of the course but an ammendment (if you will), but it was in the rules! Even so, that still gives 2 dates.
There is another problem: its a very tight schedule! For Dec 25th to be considered requires John to be conceived immediately when Zacharias got home and Jesus to be conceived immediately as well. I believe the latter part more than the former. But the is much more to it. It takes a perfect 40 week pregnancy for both (and the length of pregnancy has changed over the years).
In conclusion, if you are going to use the Course of Abia to pinpoint a date, you are opening a big can of worms. It simply becomes speculation on the best case scenario and is totally unprovable.
In conclusion, I again want to reiterate that I am not looking to prompt up my beliefs. I have them, but these are straight up, true facts that should not be ignored. Yet, they have been. I am not calling anyone a liar, I am just bringing more historical references to light.