Anonymous wrote:
Anonymous wrote:The Bible?

Funny enough, not really- only 2 mentions of it. Obviously there is nothing about December 25 since that was "declared" as the birthday some 400 odd years later- and is widely agreed upon by biblical scholars that there is no way to validate that date.
I can't help you with recommendations OP, I'm a nontheist, but I know that you probably will need to look more in modern lit to talk about 'reason for the season' type books.