I wouldn't argue that there is a segment of the religious community that would like to 'reclaim' Christmas for itself, an argument that 'it's our holiday and if you aren't going to be part of us you shouldn't be expropriating it into secular culture." Given that the Church largely expropriated Roman Solstice celebration into the Christmas festival in the first place, that the Christmas Tree is a totally pagan symbol, etc., that's a bit of hypocritical complaint. OTOH, within the Church, not losing sight of the religious meaning in the middle of all the secular hoopla that intrudes remains a useful piece of advice. So it depends a bit on who is saying it to whom.