Looks like you won that one. Of course even Stevie Wonder would have seen that coming since he couldn’t state the case for his belief in the first place.
Clarifying, not winning. I was wondering if there was something in one of the Gospels, not being Jewish, I missed or did not remember correctly. Luke's Gospel matches tradition in two different ways. First, we know that Zechariah was burning incense in the sanctuary on the Day of Atonement (celebrated in or around our month of September). When the angel appeared to Mary, he noted Elizabeth was six months pregnant, which would have made that Annunciation in our month of March. Nine months later, puts Jesus' birth in December.
While Luke did not set forth exact days, early Christian tradition has it that Jesus died on the same day as his conception--March 25. And this is where things became so tangled up for me, I still haven't been able to confirm the exact date as March 25. To start with, the Jewish calendar and the Roman calendar differed already. Next, the Roman calendar back then differed quite a lot from our Roman calendar of today. I have yet to find online any confirmed idea of when March 25 (modern calendar) fell during Passover, let alone what day March 25 would have shown up on the Roman calendar in early Christianity.
The point is, the winter solstice had nothing to do with setting the date of Christ's birth. Trying to link Christmas to Saturnalia also fails, because it appears Saturnalia was patterned after Christmas, which is quite alright. All of this was proven back in the 1930s to correct the "brainstorm" of the 1880s, which was simply supposition.
Also true is that celebrating the Resurrection was intended to eventually eclipse the celebration of Eostre on the Spring Equinox and new beginnings. Eostre was the pagan Goddess of fertility. It is why the Christian Resurrection Day is known as Easter. Personally, I love that connection, although some are horrified to the point they now refuse to refer to Resurrection Sunday as Easter Sunday. I like that the Resurrection is linked to both Spring Equinox and Passover because I think of it as God bringing His earthly family together (as different as we and our celebrations are).