As an athiest, I have no objection to religious types celebrating their holidays. I particularly like Christmas with its projections of benevolence, kindness, generosity. However, such sentiments do not emanate from Christianity. The core emotions I observed from Christianity are mean spiritedness, resentment, rage.
Indeed, during the dark ages. dominated by pure, consistent, undiluted Christianity, Christian bahavior differed little from todays Moslems in their drive to kill the infedel.