The Christmas tree is a pagan symbol of the winter solstice, that became assimilated into northern European Christianity. I think it insensitive for an Israeli retail establishment or office to display a Christmas tree. That some do so is further evidence of how secular some Israelis are. But keep in mind that Christmas celebrates the birth of a populist Jewish teacher, the greatest renegade rabbi of all time. Yehushua was born a Jew, lived as a proud Jew, and was executed by the Roman imperial authorities as a potential troublemaker. He did not start a rival religion; Saul of Tarsus is to blame for that. His followers made every word of the Tanakh part of the universal human heritage, and that's a lovely thing.
from the article: Israeli rabbis warn: Yule be in trouble if you put up Christmas trees