The Christmas tree isn't even originally Christian. It is a Druidic tradition that predates Rome or Greece. Christ wasn't even born in the winter! King Herod was holding a Census, and demanded that people return to their city of birth to be counted. He would not order that while there was snow in drifts!

The Sacred Tree, green in the dead of winter, was holy to the druids who revered the cycle of death and birth, and saw the year as that cycle in miniture. The Evergreen (and more specific sacred trees) were a symbol of enduring life and the promise of rebirth in spring.

Druids put up Stone Henge and the other stone circles to calculate the cycles of the year. Druids used to decorate the sacred tree in guts (aka 'lights' as in "lights and humbles") of their sacrifices to ensure that the winter would end and spring would come again.

Christmas is actually the Winter Solstice festival, as coopted by the Church. The candles (now electric) to decorate the tree were introduced by the Romans, who took the tradition all over Europe as a sacrament to their fertility goddess. Only by rebranding the festival could the Church get Christ into the festivities.

Christmas (the Winter Solstice) is the mirror of Easter (the Spring Equinox) named (most recently) after the fertility goddess Ester. Fertility being symbolized by rabbits (famous for being fecund) and eggs for new life.

If these idiots want to hurt Christianity then return the festival to its roots. Invite a druidic circle or a bunch of pagans to do things old school. Like 3000 BC Old School. Guts and all.