We don't. We now live in the year 2011 A.D. (Anno Domini), i.e. 2011 years since Jesus was born (the opposite being B.C. - before Christ). 2011 is not counted since the supposed birth of the earth. And I'd say that it is quite likely that the historic figure Jesus actually has existed but he wasn't born 2011 years ago though since someone sometime counted wrong with a few years. And not all religions and cultues live 2011 A.D., e.g. I am quite sure that the muslim world has a calendar of their own; counting from when Muhammad had his revelation or retuned to Mekka or something similar. I also belive that China has their own calendar and a different year than we have and probably more religions/cultures.









