I really don’t have a dog in this hunt…agree with a lot of what you’ve said. But there are many scholars who do not hold to the Saturnalia origins of Christmas (or Sol Invictus for that matter). While Christianity did “baptize” some pagan holidays (so what?), not every holiday is based on pagan ones. For instance Holy Evening (Halloween) is really not likely derived from Samhain. Correlation and proximity really prove little.