Hi Aardvark — welcome to the forum.
... Nick did not introduced it as "this is how it was" but as one of "two ideas". I do not find it satisfactory as a theory, but it is not condescending when presented as such.
I suppose I should have said it's a silly idea, and anyone who accepts it is equally silly. Nick, however, seems to believe it, as he's offering it as a reason for choosing the 25th in subsequent posts.
As I understand it there were no fixed celebrations prescribed for the early Church to observe but they adapted in accordance with the culture around them, whether Jewish or pagan...
Actually, the celebration of birthdays was frowned upon, if not actually forbidden, in Judaism — because of the links to magic and other rituals — so the Early Church followed the same practice, of not making big deals about birthdays.
The work of the Fathers, as noted above, were more to do with Christian esoterica and metaphysics, and the relation of Christ to the Cosmos, I don't think they had in mind a 'celebration' although one should not rule out specific liturgical references.
A tradition of December 25th having been established within a theological and esoteric tradition from early on, there was no reason to 'oppose' the significance of that dates arrived at by profane astronomy and cosmology ... especially when the Logos of God was seen as the Architect of all, and arrayed the heavens according to His will (a theophany) ... as ever the Christian believes the revealed data of faith illuminates the veiled realities which underpin the religious practices of their contemporaries.
Indeed, the Greek word for truth
aletheia means the state of not being hidden, of being revealed, or unveiled ... one should try and avoid discussion that conceals and deceives, rather than reveals and illuminates.
+++
One of the problems facing the contemporary Christian is the assumption that his or her faith is naive or uninformed, and founded on nothing but outmoded superstitions. Circulating such silly 'stories' without truth or foundation only exacerbates the issue — so it is incumbent upon Christians to point out errors which, if not challenged, are soon assumed to be true:
2 Timothy 3:16
"All scripture, inspired of God, is profitable to teach, to reprove, to correct, to instruct in justice... "
2 Timothy 4:2
"Preach the word: be instant in season, out of season: reprove, entreat, rebuke in all patience and doctrine."
God bless,
Thomas