Neo... the matrix has you...
Anyway, here they are:
Christmas/Pagan Solstice celebrations Part 1 (Steadfast Lutherans)
Christmas/Pagan Solstice celebrations Part 2 (Steadfast Lutherans)
Christmas/Pagan Solstice celebrations Part 3 (Steadfast Lutherans)
This brief article from Marcia Montenegro over at Sola Sisters links to quite a few more extensive and detailed articles exposing the hoax of a pagan origin to Christmas.
Sola Sisters - Myths From Hislop: A Call To Examine Facts
(added 12-9-2013) the first two articles linked at the bottom http://www.ukapologetics.net/1hislopbaby.html seem to be obsolete, so I tracked down some of them here:
THE TWO BABYLONS / THE BABYLON CONNECTION? A Book Review Copyright © 1999 Janice Moore
http://www.tektonics.org/guest/hislop01.html Critical Evaluation of "The Two Babylons", by Alexander Hislop by pastor Dustin Segers seems to be offline, but I think I tracked down a copy of it posted on a forum here
Also note that the last article linked to on that page is from a Catholic source so please read with discernment. There are certainly valid points made, even though Catholicism has added a lot of their own traditions and human teaching to the gospel, thereby corrupting it.
In particular the Catholic author references circumcision being practiced in pagan cultures and using Jeremiah 9:25-26:
I think the person was understanding it to mean “Behold, the days are coming, declares the Lord, when I will punish all those who are circumcised merely in the flesh— 26 Egypt, Judah, Edom, the sons of Ammon, Moab, and all who dwell in the desert who cut the corners of their hair," ... (meaning all of those are circumcised merely in the flesh)
"for all these nations are uncircumcised, and all the house of Israel are uncircumcised in heart.” (meaning all of these are uncircumcised in heart)
Probably the traditional interpretation of that verse would be more reasonable, that God is saying he will punish the circumcised (Israel) using the uncircumcised (all those other nations).
However, the Reformation Study Bible note says this:
9:25, 26 circumcised merely in the flesh. See 4:4. Israel is outwardly circumcised, but inwardly uncircumcised. The surrounding nations practiced circumcision, but not as a covenant sign of belonging to the Lord. Because Israel and Judah are uncircumcised in their hearts, they are effectively in the same condition as the nations. See Rom. 2:25–29; 4:9–12; 9:8; Gal. 5:6; 6:15.(click link or picture then click 'Show resources' and then the reference link under 'Reformation Study Bible')
It's also mentioned by Greg Koukl here as having originated with Egypt