Equinox and Solstice are cornerstones to life and have been so since life existed on earth. (If you don't believe that just pay attention to your own mood shifts as the seasons change, then see how the animals react to those changes... of course, there is also that crop cycle thing.)
Christmas on December 25th isn't "pagan", it's Human, it's a sign of life.
If Christians elect to celebrate their savior on that date and if Jews elect to memorialize their faith four days earlier - so be it and so what?
Isn't it of more value to acknowledge that we are all (well, lots of us) celebrating the same promise, and that we are all bound by the same values from the same source?