In more recent years, there is an awful lot of websites out there that try to indicate that Christmas and Resurrection Sunday (aka Easter) are a result of Christians trying to take over Pagan holidays and that Christ could not possibly have been born on December 25th. Ultimately, none of us in this day and age will know the truth of it until we get to Heaven (and at that point, it really won't be important any longer, will it?!).
I have read many webpages and well researched articles that discuss both sides. From the ones trying to tell me that really, we Christians tried to steal from Saturnalia for Christmas and from Ishtar for Resurrection Sunday (by using the title Easter for the day), I always come away with a bit of an ugly taste in my mouth - because it feels an awful lot like those people are very angry with Christians for daring to impose our celebration of Christ's birth and Resurrection around their pagan holidays that are more in line with celebrations of death, fertility, etc.
I am willing to consider those bits of information, but I am also willing to seriously consider information for the other side as well.
Towards that direction, here are a few "pro-Christmas/December 25th" articles for your consideration as a counter balance to all of the Saturnalia stuff out there.