Oh ye of little education (and probably a government school education at that). Much of the world uses different calendars:
I do know of those calendars, and I receive mail from a fair number of Jewish folks (I confess my mail from Islamists and Buddhists has been light of late) and they use the same dats as well. I know those calendars exist, but they are not used with great frequency. I wonder what dates newspapers in Israel use, for example? If those calendars are used to a great extent, they are yet further examples of the influence of religion (and thus God, of one sort or another) in the daily lives of most people. I apologize if I came across as xenophobic.